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Finding the Fourth Proportional to 908.22, 1,251.01 and 711.38

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Solution

The fourth proportional to 908.22, 1,251.01 and 711.38 is: 979.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.22 : 1,251.01 = 711.38 : x
  2. Step 2: Convert to fraction form
    908.22/1,251.01 = 711.38/x
  3. Step 3: Cross multiply
    908.22x = 1,251.01 × 711.38
  4. Step 4: Simplify right side
    908.22x = 889,943.49
  5. Step 5: Solve for x
    x = 889,943.49/908.22
  6. Step 6: Final answer
    x = 979.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.