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Finding the Fourth Proportional to 40,704.20, 61,007.70 and 20,972.60

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Solution

The fourth proportional to 40,704.20, 61,007.70 and 20,972.60 is: 31,433.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,704.20 : 61,007.70 = 20,972.60 : x
  2. Step 2: Convert to fraction form
    40,704.20/61,007.70 = 20,972.60/x
  3. Step 3: Cross multiply
    40,704.20x = 61,007.70 × 20,972.60
  4. Step 4: Simplify right side
    40,704.20x = 1,279,490,089.02
  5. Step 5: Solve for x
    x = 1,279,490,089.02/40,704.20
  6. Step 6: Final answer
    x = 31,433.86

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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.