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Finding the Fourth Proportional to 87,985.60, 131,978.40 and 86,673.40

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Solution

The fourth proportional to 87,985.60, 131,978.40 and 86,673.40 is: 130,010.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,985.60 : 131,978.40 = 86,673.40 : x
  2. Step 2: Convert to fraction form
    87,985.60/131,978.40 = 86,673.40/x
  3. Step 3: Cross multiply
    87,985.60x = 131,978.40 × 86,673.40
  4. Step 4: Simplify right side
    87,985.60x = 11,439,016,654.56
  5. Step 5: Solve for x
    x = 11,439,016,654.56/87,985.60
  6. Step 6: Final answer
    x = 130,010.10

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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.