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Finding the Fourth Proportional to 87,760.30, 131,640.45 and 65,728.30

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Solution

The fourth proportional to 87,760.30, 131,640.45 and 65,728.30 is: 98,592.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,760.30 : 131,640.45 = 65,728.30 : x
  2. Step 2: Convert to fraction form
    87,760.30/131,640.45 = 65,728.30/x
  3. Step 3: Cross multiply
    87,760.30x = 131,640.45 × 65,728.30
  4. Step 4: Simplify right side
    87,760.30x = 8,652,502,989.74
  5. Step 5: Solve for x
    x = 8,652,502,989.74/87,760.30
  6. Step 6: Final answer
    x = 98,592.45

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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.