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Finding the Fourth Proportional to 117,842.20, 176,331.30 and 86,738.20

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Solution

The fourth proportional to 117,842.20, 176,331.30 and 86,738.20 is: 129,789.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,842.20 : 176,331.30 = 86,738.20 : x
  2. Step 2: Convert to fraction form
    117,842.20/176,331.30 = 86,738.20/x
  3. Step 3: Cross multiply
    117,842.20x = 176,331.30 × 86,738.20
  4. Step 4: Simplify right side
    117,842.20x = 15,294,659,565.66
  5. Step 5: Solve for x
    x = 15,294,659,565.66/117,842.20
  6. Step 6: Final answer
    x = 129,789.32

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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.