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Finding the Fourth Proportional to 70,609.97, 105,915.82 and 20,691.08

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Solution

The fourth proportional to 70,609.97, 105,915.82 and 20,691.08 is: 31,036.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,609.97 : 105,915.82 = 20,691.08 : x
  2. Step 2: Convert to fraction form
    70,609.97/105,915.82 = 20,691.08/x
  3. Step 3: Cross multiply
    70,609.97x = 105,915.82 × 20,691.08
  4. Step 4: Simplify right side
    70,609.97x = 2,191,512,704.89
  5. Step 5: Solve for x
    x = 2,191,512,704.89/70,609.97
  6. Step 6: Final answer
    x = 31,036.87

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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.