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Finding the Fourth Proportional to 87,985.60, 131,978.40 and 21,425.20

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Solution

The fourth proportional to 87,985.60, 131,978.40 and 21,425.20 is: 32,137.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,985.60 : 131,978.40 = 21,425.20 : x
  2. Step 2: Convert to fraction form
    87,985.60/131,978.40 = 21,425.20/x
  3. Step 3: Cross multiply
    87,985.60x = 131,978.40 × 21,425.20
  4. Step 4: Simplify right side
    87,985.60x = 2,827,663,615.68
  5. Step 5: Solve for x
    x = 2,827,663,615.68/87,985.60
  6. Step 6: Final answer
    x = 32,137.80

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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.