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Finding the Fourth Proportional to 138,555.59, 207,832.12 and 43,785.79

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Solution

The fourth proportional to 138,555.59, 207,832.12 and 43,785.79 is: 65,678.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,555.59 : 207,832.12 = 43,785.79 : x
  2. Step 2: Convert to fraction form
    138,555.59/207,832.12 = 43,785.79/x
  3. Step 3: Cross multiply
    138,555.59x = 207,832.12 × 43,785.79
  4. Step 4: Simplify right side
    138,555.59x = 9,100,093,561.57
  5. Step 5: Solve for x
    x = 9,100,093,561.57/138,555.59
  6. Step 6: Final answer
    x = 65,678.29

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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.