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Finding the Fourth Proportional to 72,752.58, 100,399.91 and 40,489.88

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Solution

The fourth proportional to 72,752.58, 100,399.91 and 40,489.88 is: 55,876.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,752.58 : 100,399.91 = 40,489.88 : x
  2. Step 2: Convert to fraction form
    72,752.58/100,399.91 = 40,489.88/x
  3. Step 3: Cross multiply
    72,752.58x = 100,399.91 × 40,489.88
  4. Step 4: Simplify right side
    72,752.58x = 4,065,179,603.46
  5. Step 5: Solve for x
    x = 4,065,179,603.46/72,752.58
  6. Step 6: Final answer
    x = 55,876.78

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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.