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Finding the Fourth Proportional to 72,480.60, 108,720.90 and 45,908.55

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Solution

The fourth proportional to 72,480.60, 108,720.90 and 45,908.55 is: 68,862.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,480.60 : 108,720.90 = 45,908.55 : x
  2. Step 2: Convert to fraction form
    72,480.60/108,720.90 = 45,908.55/x
  3. Step 3: Cross multiply
    72,480.60x = 108,720.90 × 45,908.55
  4. Step 4: Simplify right side
    72,480.60x = 4,991,218,873.70
  5. Step 5: Solve for x
    x = 4,991,218,873.70/72,480.60
  6. Step 6: Final answer
    x = 68,862.83

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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.