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Finding the Fourth Proportional to 688.92, 1,032.74 and 255.75

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Solution

The fourth proportional to 688.92, 1,032.74 and 255.75 is: 383.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.92 : 1,032.74 = 255.75 : x
  2. Step 2: Convert to fraction form
    688.92/1,032.74 = 255.75/x
  3. Step 3: Cross multiply
    688.92x = 1,032.74 × 255.75
  4. Step 4: Simplify right side
    688.92x = 264,121.98
  5. Step 5: Solve for x
    x = 264,121.98/688.92
  6. Step 6: Final answer
    x = 383.39

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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.