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Finding the Fourth Proportional to 85,654.67, 128,508.28 and 38,309.58

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Solution

The fourth proportional to 85,654.67, 128,508.28 and 38,309.58 is: 57,476.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,654.67 : 128,508.28 = 38,309.58 : x
  2. Step 2: Convert to fraction form
    85,654.67/128,508.28 = 38,309.58/x
  3. Step 3: Cross multiply
    85,654.67x = 128,508.28 × 38,309.58
  4. Step 4: Simplify right side
    85,654.67x = 4,923,098,619.45
  5. Step 5: Solve for x
    x = 4,923,098,619.45/85,654.67
  6. Step 6: Final answer
    x = 57,476.13

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1.5x scale

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.