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Finding the Fourth Proportional to 72,310.53, 99,787.77 and 40,479.69

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Solution

The fourth proportional to 72,310.53, 99,787.77 and 40,479.69 is: 55,861.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,310.53 : 99,787.77 = 40,479.69 : x
  2. Step 2: Convert to fraction form
    72,310.53/99,787.77 = 40,479.69/x
  3. Step 3: Cross multiply
    72,310.53x = 99,787.77 × 40,479.69
  4. Step 4: Simplify right side
    72,310.53x = 4,039,377,995.39
  5. Step 5: Solve for x
    x = 4,039,377,995.39/72,310.53
  6. Step 6: Final answer
    x = 55,861.55

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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.