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Finding the Fourth Proportional to 138,433.67, 207,348.90 and 90,995.21

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Solution

The fourth proportional to 138,433.67, 207,348.90 and 90,995.21 is: 136,294.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,433.67 : 207,348.90 = 90,995.21 : x
  2. Step 2: Convert to fraction form
    138,433.67/207,348.90 = 90,995.21/x
  3. Step 3: Cross multiply
    138,433.67x = 207,348.90 × 90,995.21
  4. Step 4: Simplify right side
    138,433.67x = 18,867,755,207.05
  5. Step 5: Solve for x
    x = 18,867,755,207.05/138,433.67
  6. Step 6: Final answer
    x = 136,294.56

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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.