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Finding the Fourth Proportional to 687.92, 1,031.74 and 254.97

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Solution

The fourth proportional to 687.92, 1,031.74 and 254.97 is: 382.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.92 : 1,031.74 = 254.97 : x
  2. Step 2: Convert to fraction form
    687.92/1,031.74 = 254.97/x
  3. Step 3: Cross multiply
    687.92x = 1,031.74 × 254.97
  4. Step 4: Simplify right side
    687.92x = 263,062.11
  5. Step 5: Solve for x
    x = 263,062.11/687.92
  6. Step 6: Final answer
    x = 382.40

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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.