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Finding the Fourth Proportional to 687.43, 1,031.55 and 254.89

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Solution

The fourth proportional to 687.43, 1,031.55 and 254.89 is: 382.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.43 : 1,031.55 = 254.89 : x
  2. Step 2: Convert to fraction form
    687.43/1,031.55 = 254.89/x
  3. Step 3: Cross multiply
    687.43x = 1,031.55 × 254.89
  4. Step 4: Simplify right side
    687.43x = 262,931.78
  5. Step 5: Solve for x
    x = 262,931.78/687.43
  6. Step 6: Final answer
    x = 382.49

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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.