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Finding the Fourth Proportional to 71,917.40, 99,245.04 and 40,087.64

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Solution

The fourth proportional to 71,917.40, 99,245.04 and 40,087.64 is: 55,320.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,917.40 : 99,245.04 = 40,087.64 : x
  2. Step 2: Convert to fraction form
    71,917.40/99,245.04 = 40,087.64/x
  3. Step 3: Cross multiply
    71,917.40x = 99,245.04 × 40,087.64
  4. Step 4: Simplify right side
    71,917.40x = 3,978,499,435.31
  5. Step 5: Solve for x
    x = 3,978,499,435.31/71,917.40
  6. Step 6: Final answer
    x = 55,320.40

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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.