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Finding the Fourth Proportional to 72,149.72, 108,248.57 and 45,464.87

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Solution

The fourth proportional to 72,149.72, 108,248.57 and 45,464.87 is: 68,212.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,149.72 : 108,248.57 = 45,464.87 : x
  2. Step 2: Convert to fraction form
    72,149.72/108,248.57 = 45,464.87/x
  3. Step 3: Cross multiply
    72,149.72x = 108,248.57 × 45,464.87
  4. Step 4: Simplify right side
    72,149.72x = 4,921,506,935.41
  5. Step 5: Solve for x
    x = 4,921,506,935.41/72,149.72
  6. Step 6: Final answer
    x = 68,212.42

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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.