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Finding the Fourth Proportional to 100,939.40, 151,409.10 and 67,761.80

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Solution

The fourth proportional to 100,939.40, 151,409.10 and 67,761.80 is: 101,642.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,939.40 : 151,409.10 = 67,761.80 : x
  2. Step 2: Convert to fraction form
    100,939.40/151,409.10 = 67,761.80/x
  3. Step 3: Cross multiply
    100,939.40x = 151,409.10 × 67,761.80
  4. Step 4: Simplify right side
    100,939.40x = 10,259,753,152.38
  5. Step 5: Solve for x
    x = 10,259,753,152.38/100,939.40
  6. Step 6: Final answer
    x = 101,642.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.