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Finding the Fourth Proportional to 11,750.76, 16,218.87 and 7,980.21

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Solution

The fourth proportional to 11,750.76, 16,218.87 and 7,980.21 is: 11,014.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,750.76 : 16,218.87 = 7,980.21 : x
  2. Step 2: Convert to fraction form
    11,750.76/16,218.87 = 7,980.21/x
  3. Step 3: Cross multiply
    11,750.76x = 16,218.87 × 7,980.21
  4. Step 4: Simplify right side
    11,750.76x = 129,429,988.56
  5. Step 5: Solve for x
    x = 129,429,988.56/11,750.76
  6. Step 6: Final answer
    x = 11,014.61

Related Problems

Find fourth proportional to 5,875.38, 8,109.44 and 3,990.11
Half scale
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Double scale
Find fourth proportional to 11,751.76, 16,220.25 and 7,981.21
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.