Home / 7,887.20-11,830.80-3,991.10

Finding the Fourth Proportional to 7,887.20, 11,830.80 and 3,991.10

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Solution

The fourth proportional to 7,887.20, 11,830.80 and 3,991.10 is: 5,986.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,887.20 : 11,830.80 = 3,991.10 : x
  2. Step 2: Convert to fraction form
    7,887.20/11,830.80 = 3,991.10/x
  3. Step 3: Cross multiply
    7,887.20x = 11,830.80 × 3,991.10
  4. Step 4: Simplify right side
    7,887.20x = 47,217,905.88
  5. Step 5: Solve for x
    x = 47,217,905.88/7,887.20
  6. Step 6: Final answer
    x = 5,986.65

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.