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Finding the Fourth Proportional to 87,321.60, 130,982.40 and 28,159.20

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Solution

The fourth proportional to 87,321.60, 130,982.40 and 28,159.20 is: 42,238.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,321.60 : 130,982.40 = 28,159.20 : x
  2. Step 2: Convert to fraction form
    87,321.60/130,982.40 = 28,159.20/x
  3. Step 3: Cross multiply
    87,321.60x = 130,982.40 × 28,159.20
  4. Step 4: Simplify right side
    87,321.60x = 3,688,359,598.08
  5. Step 5: Solve for x
    x = 3,688,359,598.08/87,321.60
  6. Step 6: Final answer
    x = 42,238.80

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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.