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Finding the Fourth Proportional to 91,991.95, 138,041.46 and 38,680.07

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Solution

The fourth proportional to 91,991.95, 138,041.46 and 38,680.07 is: 58,042.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,991.95 : 138,041.46 = 38,680.07 : x
  2. Step 2: Convert to fraction form
    91,991.95/138,041.46 = 38,680.07/x
  3. Step 3: Cross multiply
    91,991.95x = 138,041.46 × 38,680.07
  4. Step 4: Simplify right side
    91,991.95x = 5,339,452,645.49
  5. Step 5: Solve for x
    x = 5,339,452,645.49/91,991.95
  6. Step 6: Final answer
    x = 58,042.61

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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.