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Finding the Fourth Proportional to 687.52, 1,031.28 and 270.91

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Solution

The fourth proportional to 687.52, 1,031.28 and 270.91 is: 406.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.52 : 1,031.28 = 270.91 : x
  2. Step 2: Convert to fraction form
    687.52/1,031.28 = 270.91/x
  3. Step 3: Cross multiply
    687.52x = 1,031.28 × 270.91
  4. Step 4: Simplify right side
    687.52x = 279,384.06
  5. Step 5: Solve for x
    x = 279,384.06/687.52
  6. Step 6: Final answer
    x = 406.37

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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.