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Finding the Fourth Proportional to 71,207.19, 106,807.13 and 21,287.70

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Solution

The fourth proportional to 71,207.19, 106,807.13 and 21,287.70 is: 31,930.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,207.19 : 106,807.13 = 21,287.70 : x
  2. Step 2: Convert to fraction form
    71,207.19/106,807.13 = 21,287.70/x
  3. Step 3: Cross multiply
    71,207.19x = 106,807.13 × 21,287.70
  4. Step 4: Simplify right side
    71,207.19x = 2,273,678,034.86
  5. Step 5: Solve for x
    x = 2,273,678,034.86/71,207.19
  6. Step 6: Final answer
    x = 31,930.46

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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.