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Finding the Fourth Proportional to 87,213.80, 130,626.30 and 71,661.80

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Solution

The fourth proportional to 87,213.80, 130,626.30 and 71,661.80 is: 107,332.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,213.80 : 130,626.30 = 71,661.80 : x
  2. Step 2: Convert to fraction form
    87,213.80/130,626.30 = 71,661.80/x
  3. Step 3: Cross multiply
    87,213.80x = 130,626.30 × 71,661.80
  4. Step 4: Simplify right side
    87,213.80x = 9,360,915,785.34
  5. Step 5: Solve for x
    x = 9,360,915,785.34/87,213.80
  6. Step 6: Final answer
    x = 107,332.97

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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.