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Finding the Fourth Proportional to 72,616.20, 108,902.70 and 28,217.40

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Solution

The fourth proportional to 72,616.20, 108,902.70 and 28,217.40 is: 42,317.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,616.20 : 108,902.70 = 28,217.40 : x
  2. Step 2: Convert to fraction form
    72,616.20/108,902.70 = 28,217.40/x
  3. Step 3: Cross multiply
    72,616.20x = 108,902.70 × 28,217.40
  4. Step 4: Simplify right side
    72,616.20x = 3,072,951,046.98
  5. Step 5: Solve for x
    x = 3,072,951,046.98/72,616.20
  6. Step 6: Final answer
    x = 42,317.71

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1.5x scale

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.