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Finding the Fourth Proportional to 87,443.80, 120,668.88 and 51,645.40

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Solution

The fourth proportional to 87,443.80, 120,668.88 and 51,645.40 is: 71,268.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,443.80 : 120,668.88 = 51,645.40 : x
  2. Step 2: Convert to fraction form
    87,443.80/120,668.88 = 51,645.40/x
  3. Step 3: Cross multiply
    87,443.80x = 120,668.88 × 51,645.40
  4. Step 4: Simplify right side
    87,443.80x = 6,231,992,575.15
  5. Step 5: Solve for x
    x = 6,231,992,575.15/87,443.80
  6. Step 6: Final answer
    x = 71,268.55

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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.