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Finding the Fourth Proportional to 31,902.80, 47,861.40 and 18,748.40

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Solution

The fourth proportional to 31,902.80, 47,861.40 and 18,748.40 is: 28,126.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,902.80 : 47,861.40 = 18,748.40 : x
  2. Step 2: Convert to fraction form
    31,902.80/47,861.40 = 18,748.40/x
  3. Step 3: Cross multiply
    31,902.80x = 47,861.40 × 18,748.40
  4. Step 4: Simplify right side
    31,902.80x = 897,324,671.76
  5. Step 5: Solve for x
    x = 897,324,671.76/31,902.80
  6. Step 6: Final answer
    x = 28,126.83

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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.