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Finding the Fourth Proportional to 85,976.38, 128,988.42 and 36,044.74

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Solution

The fourth proportional to 85,976.38, 128,988.42 and 36,044.74 is: 54,077.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,976.38 : 128,988.42 = 36,044.74 : x
  2. Step 2: Convert to fraction form
    85,976.38/128,988.42 = 36,044.74/x
  3. Step 3: Cross multiply
    85,976.38x = 128,988.42 × 36,044.74
  4. Step 4: Simplify right side
    85,976.38x = 4,649,354,061.91
  5. Step 5: Solve for x
    x = 4,649,354,061.91/85,976.38
  6. Step 6: Final answer
    x = 54,077.11

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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.