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Finding the Fourth Proportional to 71,978.45, 99,330.39 and 40,149.40

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Solution

The fourth proportional to 71,978.45, 99,330.39 and 40,149.40 is: 55,406.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,978.45 : 99,330.39 = 40,149.40 : x
  2. Step 2: Convert to fraction form
    71,978.45/99,330.39 = 40,149.40/x
  3. Step 3: Cross multiply
    71,978.45x = 99,330.39 × 40,149.40
  4. Step 4: Simplify right side
    71,978.45x = 3,988,055,560.27
  5. Step 5: Solve for x
    x = 3,988,055,560.27/71,978.45
  6. Step 6: Final answer
    x = 55,406.24

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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.