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Finding the Fourth Proportional to 687.28, 1,031.64 and 496.12

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Solution

The fourth proportional to 687.28, 1,031.64 and 496.12 is: 744.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.28 : 1,031.64 = 496.12 : x
  2. Step 2: Convert to fraction form
    687.28/1,031.64 = 496.12/x
  3. Step 3: Cross multiply
    687.28x = 1,031.64 × 496.12
  4. Step 4: Simplify right side
    687.28x = 511,817.24
  5. Step 5: Solve for x
    x = 511,817.24/687.28
  6. Step 6: Final answer
    x = 744.70

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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.