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Finding the Fourth Proportional to 87,530.52, 120,720.78 and 55,644.60

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Solution

The fourth proportional to 87,530.52, 120,720.78 and 55,644.60 is: 76,744.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,530.52 : 120,720.78 = 55,644.60 : x
  2. Step 2: Convert to fraction form
    87,530.52/120,720.78 = 55,644.60/x
  3. Step 3: Cross multiply
    87,530.52x = 120,720.78 × 55,644.60
  4. Step 4: Simplify right side
    87,530.52x = 6,717,459,514.79
  5. Step 5: Solve for x
    x = 6,717,459,514.79/87,530.52
  6. Step 6: Final answer
    x = 76,744.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.