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Finding the Fourth Proportional to 71,909.88, 99,239.04 and 40,079.01

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Solution

The fourth proportional to 71,909.88, 99,239.04 and 40,079.01 is: 55,310.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,909.88 : 99,239.04 = 40,079.01 : x
  2. Step 2: Convert to fraction form
    71,909.88/99,239.04 = 40,079.01/x
  3. Step 3: Cross multiply
    71,909.88x = 99,239.04 × 40,079.01
  4. Step 4: Simplify right side
    71,909.88x = 3,977,402,476.55
  5. Step 5: Solve for x
    x = 3,977,402,476.55/71,909.88
  6. Step 6: Final answer
    x = 55,310.93

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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.