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Finding the Fourth Proportional to 74,428.60, 111,470.10 and 72,700.60

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Solution

The fourth proportional to 74,428.60, 111,470.10 and 72,700.60 is: 108,882.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,428.60 : 111,470.10 = 72,700.60 : x
  2. Step 2: Convert to fraction form
    74,428.60/111,470.10 = 72,700.60/x
  3. Step 3: Cross multiply
    74,428.60x = 111,470.10 × 72,700.60
  4. Step 4: Simplify right side
    74,428.60x = 8,103,943,152.06
  5. Step 5: Solve for x
    x = 8,103,943,152.06/74,428.60
  6. Step 6: Final answer
    x = 108,882.11

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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.