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Finding the Fourth Proportional to 87,615.50, 120,909.40 and 47,871.50

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Solution

The fourth proportional to 87,615.50, 120,909.40 and 47,871.50 is: 66,062.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,615.50 : 120,909.40 = 47,871.50 : x
  2. Step 2: Convert to fraction form
    87,615.50/120,909.40 = 47,871.50/x
  3. Step 3: Cross multiply
    87,615.50x = 120,909.40 × 47,871.50
  4. Step 4: Simplify right side
    87,615.50x = 5,788,114,342.10
  5. Step 5: Solve for x
    x = 5,788,114,342.10/87,615.50
  6. Step 6: Final answer
    x = 66,062.68

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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.