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Finding the Fourth Proportional to 134,857,778.40, 186,103,734.12 and 72,978,116.88

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Solution

The fourth proportional to 134,857,778.40, 186,103,734.12 and 72,978,116.88 is: 100,709,801.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    134,857,778.40 : 186,103,734.12 = 72,978,116.88 : x
  2. Step 2: Convert to fraction form
    134,857,778.40/186,103,734.12 = 72,978,116.88/x
  3. Step 3: Cross multiply
    134,857,778.40x = 186,103,734.12 × 72,978,116.88
  4. Step 4: Simplify right side
    134,857,778.40x = 13,581,500,060,413,804
  5. Step 5: Solve for x
    x = 13,581,500,060,413,804/134,857,778.40
  6. Step 6: Final answer
    x = 100,709,801.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.