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Finding the Fourth Proportional to 87,436.80, 120,659.31 and 51,638.31

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Solution

The fourth proportional to 87,436.80, 120,659.31 and 51,638.31 is: 71,258.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,436.80 : 120,659.31 = 51,638.31 : x
  2. Step 2: Convert to fraction form
    87,436.80/120,659.31 = 51,638.31/x
  3. Step 3: Cross multiply
    87,436.80x = 120,659.31 × 51,638.31
  4. Step 4: Simplify right side
    87,436.80x = 6,230,642,854.17
  5. Step 5: Solve for x
    x = 6,230,642,854.17/87,436.80
  6. Step 6: Final answer
    x = 71,258.82

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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.