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Finding the Fourth Proportional to 109,679.35, 151,360.61 and 61,939.88

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Solution

The fourth proportional to 109,679.35, 151,360.61 and 61,939.88 is: 85,478.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,679.35 : 151,360.61 = 61,939.88 : x
  2. Step 2: Convert to fraction form
    109,679.35/151,360.61 = 61,939.88/x
  3. Step 3: Cross multiply
    109,679.35x = 151,360.61 × 61,939.88
  4. Step 4: Simplify right side
    109,679.35x = 9,375,258,020.13
  5. Step 5: Solve for x
    x = 9,375,258,020.13/109,679.35
  6. Step 6: Final answer
    x = 85,478.79

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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.