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Finding the Fourth Proportional to 81,047.20, 121,513.20 and 36,695.20

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Solution

The fourth proportional to 81,047.20, 121,513.20 and 36,695.20 is: 55,016.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,047.20 : 121,513.20 = 36,695.20 : x
  2. Step 2: Convert to fraction form
    81,047.20/121,513.20 = 36,695.20/x
  3. Step 3: Cross multiply
    81,047.20x = 121,513.20 × 36,695.20
  4. Step 4: Simplify right side
    81,047.20x = 4,458,951,176.64
  5. Step 5: Solve for x
    x = 4,458,951,176.64/81,047.20
  6. Step 6: Final answer
    x = 55,016.72

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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.