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Finding the Fourth Proportional to 71,892, 99,209.62 and 39,186.69

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Solution

The fourth proportional to 71,892, 99,209.62 and 39,186.69 is: 54,076.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,892 : 99,209.62 = 39,186.69 : x
  2. Step 2: Convert to fraction form
    71,892/99,209.62 = 39,186.69/x
  3. Step 3: Cross multiply
    71,892x = 99,209.62 × 39,186.69
  4. Step 4: Simplify right side
    71,892x = 3,887,696,623.96
  5. Step 5: Solve for x
    x = 3,887,696,623.96/71,892
  6. Step 6: Final answer
    x = 54,076.90

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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.