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Finding the Fourth Proportional to 66,737.67, 100,122.91 and 19,990.55

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Solution

The fourth proportional to 66,737.67, 100,122.91 and 19,990.55 is: 29,990.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,737.67 : 100,122.91 = 19,990.55 : x
  2. Step 2: Convert to fraction form
    66,737.67/100,122.91 = 19,990.55/x
  3. Step 3: Cross multiply
    66,737.67x = 100,122.91 × 19,990.55
  4. Step 4: Simplify right side
    66,737.67x = 2,001,511,731.86
  5. Step 5: Solve for x
    x = 2,001,511,731.86/66,737.67
  6. Step 6: Final answer
    x = 29,990.73

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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.