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Finding the Fourth Proportional to 87,419.20, 131,128.80 and 86,641.60

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Solution

The fourth proportional to 87,419.20, 131,128.80 and 86,641.60 is: 129,962.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,419.20 : 131,128.80 = 86,641.60 : x
  2. Step 2: Convert to fraction form
    87,419.20/131,128.80 = 86,641.60/x
  3. Step 3: Cross multiply
    87,419.20x = 131,128.80 × 86,641.60
  4. Step 4: Simplify right side
    87,419.20x = 11,361,209,038.08
  5. Step 5: Solve for x
    x = 11,361,209,038.08/87,419.20
  6. Step 6: Final answer
    x = 129,962.40

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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.