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Finding the Fourth Proportional to 61,654.80, 85,086.24 and 38,985.60

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Solution

The fourth proportional to 61,654.80, 85,086.24 and 38,985.60 is: 53,801.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,654.80 : 85,086.24 = 38,985.60 : x
  2. Step 2: Convert to fraction form
    61,654.80/85,086.24 = 38,985.60/x
  3. Step 3: Cross multiply
    61,654.80x = 85,086.24 × 38,985.60
  4. Step 4: Simplify right side
    61,654.80x = 3,317,138,118.14
  5. Step 5: Solve for x
    x = 3,317,138,118.14/61,654.80
  6. Step 6: Final answer
    x = 53,801.78

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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.