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Finding the Fourth Proportional to 78,312,251.80, 117,468,377.70 and 62,187,938.20

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Solution

The fourth proportional to 78,312,251.80, 117,468,377.70 and 62,187,938.20 is: 93,281,907.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,312,251.80 : 117,468,377.70 = 62,187,938.20 : x
  2. Step 2: Convert to fraction form
    78,312,251.80/117,468,377.70 = 62,187,938.20/x
  3. Step 3: Cross multiply
    78,312,251.80x = 117,468,377.70 × 62,187,938.20
  4. Step 4: Simplify right side
    78,312,251.80x = 7,305,116,212,861,859
  5. Step 5: Solve for x
    x = 7,305,116,212,861,859/78,312,251.80
  6. Step 6: Final answer
    x = 93,281,907.30

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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.