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Finding the Fourth Proportional to 10,090.60, 15,135.90 and 7,901.20

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Solution

The fourth proportional to 10,090.60, 15,135.90 and 7,901.20 is: 11,851.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,090.60 : 15,135.90 = 7,901.20 : x
  2. Step 2: Convert to fraction form
    10,090.60/15,135.90 = 7,901.20/x
  3. Step 3: Cross multiply
    10,090.60x = 15,135.90 × 7,901.20
  4. Step 4: Simplify right side
    10,090.60x = 119,591,773.08
  5. Step 5: Solve for x
    x = 119,591,773.08/10,090.60
  6. Step 6: Final answer
    x = 11,851.80

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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.