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Finding the Fourth Proportional to 87,987.88, 131,980.46 and 21,427.90

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Solution

The fourth proportional to 87,987.88, 131,980.46 and 21,427.90 is: 32,141.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,987.88 : 131,980.46 = 21,427.90 : x
  2. Step 2: Convert to fraction form
    87,987.88/131,980.46 = 21,427.90/x
  3. Step 3: Cross multiply
    87,987.88x = 131,980.46 × 21,427.90
  4. Step 4: Simplify right side
    87,987.88x = 2,828,064,098.83
  5. Step 5: Solve for x
    x = 2,828,064,098.83/87,987.88
  6. Step 6: Final answer
    x = 32,141.52

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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.