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Finding the Fourth Proportional to 138,672.71, 208,040.18 and 43,908.57

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Solution

The fourth proportional to 138,672.71, 208,040.18 and 43,908.57 is: 65,872.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,672.71 : 208,040.18 = 43,908.57 : x
  2. Step 2: Convert to fraction form
    138,672.71/208,040.18 = 43,908.57/x
  3. Step 3: Cross multiply
    138,672.71x = 208,040.18 × 43,908.57
  4. Step 4: Simplify right side
    138,672.71x = 9,134,746,806.34
  5. Step 5: Solve for x
    x = 9,134,746,806.34/138,672.71
  6. Step 6: Final answer
    x = 65,872.71

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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.