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Finding the Fourth Proportional to 78,781.61, 108,687.65 and 48,514.43

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Solution

The fourth proportional to 78,781.61, 108,687.65 and 48,514.43 is: 66,930.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,781.61 : 108,687.65 = 48,514.43 : x
  2. Step 2: Convert to fraction form
    78,781.61/108,687.65 = 48,514.43/x
  3. Step 3: Cross multiply
    78,781.61x = 108,687.65 × 48,514.43
  4. Step 4: Simplify right side
    78,781.61x = 5,272,919,416.94
  5. Step 5: Solve for x
    x = 5,272,919,416.94/78,781.61
  6. Step 6: Final answer
    x = 66,930.84

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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.