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Finding the Fourth Proportional to 688.02, 1,031.85 and 255.30

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Solution

The fourth proportional to 688.02, 1,031.85 and 255.30 is: 382.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.02 : 1,031.85 = 255.30 : x
  2. Step 2: Convert to fraction form
    688.02/1,031.85 = 255.30/x
  3. Step 3: Cross multiply
    688.02x = 1,031.85 × 255.30
  4. Step 4: Simplify right side
    688.02x = 263,431.31
  5. Step 5: Solve for x
    x = 263,431.31/688.02
  6. Step 6: Final answer
    x = 382.88

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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.