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Finding the Fourth Proportional to 268,266.40, 402,399.60 and 81,287.20

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Solution

The fourth proportional to 268,266.40, 402,399.60 and 81,287.20 is: 121,930.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,266.40 : 402,399.60 = 81,287.20 : x
  2. Step 2: Convert to fraction form
    268,266.40/402,399.60 = 81,287.20/x
  3. Step 3: Cross multiply
    268,266.40x = 402,399.60 × 81,287.20
  4. Step 4: Simplify right side
    268,266.40x = 32,709,936,765.12
  5. Step 5: Solve for x
    x = 32,709,936,765.12/268,266.40
  6. Step 6: Final answer
    x = 121,930.80

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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.