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Finding the Fourth Proportional to 72,691,682.70, 108,931,235.85 and 61,850,286.30

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Solution

The fourth proportional to 72,691,682.70, 108,931,235.85 and 61,850,286.30 is: 92,684,993.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,691,682.70 : 108,931,235.85 = 61,850,286.30 : x
  2. Step 2: Convert to fraction form
    72,691,682.70/108,931,235.85 = 61,850,286.30/x
  3. Step 3: Cross multiply
    72,691,682.70x = 108,931,235.85 × 61,850,286.30
  4. Step 4: Simplify right side
    72,691,682.70x = 6,737,428,124,335,323
  5. Step 5: Solve for x
    x = 6,737,428,124,335,323/72,691,682.70
  6. Step 6: Final answer
    x = 92,684,993.30

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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.