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Finding the Fourth Proportional to 70,609.38, 105,928.65 and 20,691.11

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Solution

The fourth proportional to 70,609.38, 105,928.65 and 20,691.11 is: 31,040.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,609.38 : 105,928.65 = 20,691.11 : x
  2. Step 2: Convert to fraction form
    70,609.38/105,928.65 = 20,691.11/x
  3. Step 3: Cross multiply
    70,609.38x = 105,928.65 × 20,691.11
  4. Step 4: Simplify right side
    70,609.38x = 2,191,780,819.66
  5. Step 5: Solve for x
    x = 2,191,780,819.66/70,609.38
  6. Step 6: Final answer
    x = 31,040.93

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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.