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Finding the Fourth Proportional to 72,310.59, 99,788.76 and 40,480.02

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Solution

The fourth proportional to 72,310.59, 99,788.76 and 40,480.02 is: 55,862.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,310.59 : 99,788.76 = 40,480.02 : x
  2. Step 2: Convert to fraction form
    72,310.59/99,788.76 = 40,480.02/x
  3. Step 3: Cross multiply
    72,310.59x = 99,788.76 × 40,480.02
  4. Step 4: Simplify right side
    72,310.59x = 4,039,451,000.58
  5. Step 5: Solve for x
    x = 4,039,451,000.58/72,310.59
  6. Step 6: Final answer
    x = 55,862.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.