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Finding the Fourth Proportional to 72,294.56, 99,743.76 and 40,458.40

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Solution

The fourth proportional to 72,294.56, 99,743.76 and 40,458.40 is: 55,819.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,294.56 : 99,743.76 = 40,458.40 : x
  2. Step 2: Convert to fraction form
    72,294.56/99,743.76 = 40,458.40/x
  3. Step 3: Cross multiply
    72,294.56x = 99,743.76 × 40,458.40
  4. Step 4: Simplify right side
    72,294.56x = 4,035,472,939.58
  5. Step 5: Solve for x
    x = 4,035,472,939.58/72,294.56
  6. Step 6: Final answer
    x = 55,819.87

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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.