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Finding the Fourth Proportional to 12,390.76, 17,100.14 and 7,085.44

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Solution

The fourth proportional to 12,390.76, 17,100.14 and 7,085.44 is: 9,778.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.76 : 17,100.14 = 7,085.44 : x
  2. Step 2: Convert to fraction form
    12,390.76/17,100.14 = 7,085.44/x
  3. Step 3: Cross multiply
    12,390.76x = 17,100.14 × 7,085.44
  4. Step 4: Simplify right side
    12,390.76x = 121,162,015.96
  5. Step 5: Solve for x
    x = 121,162,015.96/12,390.76
  6. Step 6: Final answer
    x = 9,778.42

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Half scale
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Double scale
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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.