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Finding the Fourth Proportional to 91,479.18, 137,041.21 and 67,419.78

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Solution

The fourth proportional to 91,479.18, 137,041.21 and 67,419.78 is: 100,998.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,479.18 : 137,041.21 = 67,419.78 : x
  2. Step 2: Convert to fraction form
    91,479.18/137,041.21 = 67,419.78/x
  3. Step 3: Cross multiply
    91,479.18x = 137,041.21 × 67,419.78
  4. Step 4: Simplify right side
    91,479.18x = 9,239,288,229.13
  5. Step 5: Solve for x
    x = 9,239,288,229.13/91,479.18
  6. Step 6: Final answer
    x = 100,998.81

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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.