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Finding the Fourth Proportional to 87,985.42, 131,978.14 and 28,821.40

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Solution

The fourth proportional to 87,985.42, 131,978.14 and 28,821.40 is: 43,232.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,985.42 : 131,978.14 = 28,821.40 : x
  2. Step 2: Convert to fraction form
    87,985.42/131,978.14 = 28,821.40/x
  3. Step 3: Cross multiply
    87,985.42x = 131,978.14 × 28,821.40
  4. Step 4: Simplify right side
    87,985.42x = 3,803,794,764.20
  5. Step 5: Solve for x
    x = 3,803,794,764.20/87,985.42
  6. Step 6: Final answer
    x = 43,232.10

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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.