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Finding the Fourth Proportional to 72,720.50, 100,346.61 and 40,449.87

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Solution

The fourth proportional to 72,720.50, 100,346.61 and 40,449.87 is: 55,816.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,720.50 : 100,346.61 = 40,449.87 : x
  2. Step 2: Convert to fraction form
    72,720.50/100,346.61 = 40,449.87/x
  3. Step 3: Cross multiply
    72,720.50x = 100,346.61 × 40,449.87
  4. Step 4: Simplify right side
    72,720.50x = 4,059,007,329.44
  5. Step 5: Solve for x
    x = 4,059,007,329.44/72,720.50
  6. Step 6: Final answer
    x = 55,816.55

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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.