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Finding the Fourth Proportional to 71,961.65, 99,304.89 and 40,135.94

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Solution

The fourth proportional to 71,961.65, 99,304.89 and 40,135.94 is: 55,386.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,961.65 : 99,304.89 = 40,135.94 : x
  2. Step 2: Convert to fraction form
    71,961.65/99,304.89 = 40,135.94/x
  3. Step 3: Cross multiply
    71,961.65x = 99,304.89 × 40,135.94
  4. Step 4: Simplify right side
    71,961.65x = 3,985,695,106.75
  5. Step 5: Solve for x
    x = 3,985,695,106.75/71,961.65
  6. Step 6: Final answer
    x = 55,386.38

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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.