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Finding the Fourth Proportional to 111,992.70, 154,549.92 and 61,691.70

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Solution

The fourth proportional to 111,992.70, 154,549.92 and 61,691.70 is: 85,134.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,992.70 : 154,549.92 = 61,691.70 : x
  2. Step 2: Convert to fraction form
    111,992.70/154,549.92 = 61,691.70/x
  3. Step 3: Cross multiply
    111,992.70x = 154,549.92 × 61,691.70
  4. Step 4: Simplify right side
    111,992.70x = 9,534,447,299.66
  5. Step 5: Solve for x
    x = 9,534,447,299.66/111,992.70
  6. Step 6: Final answer
    x = 85,134.54

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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.