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Finding the Fourth Proportional to 78,906.38, 108,890.80 and 45,372.38

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Solution

The fourth proportional to 78,906.38, 108,890.80 and 45,372.38 is: 62,613.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,906.38 : 108,890.80 = 45,372.38 : x
  2. Step 2: Convert to fraction form
    78,906.38/108,890.80 = 45,372.38/x
  3. Step 3: Cross multiply
    78,906.38x = 108,890.80 × 45,372.38
  4. Step 4: Simplify right side
    78,906.38x = 4,940,634,098.22
  5. Step 5: Solve for x
    x = 4,940,634,098.22/78,906.38
  6. Step 6: Final answer
    x = 62,613.88

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1.5x scale

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.