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Finding the Fourth Proportional to 687.93, 1,031.99 and 255.05

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Solution

The fourth proportional to 687.93, 1,031.99 and 255.05 is: 382.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.93 : 1,031.99 = 255.05 : x
  2. Step 2: Convert to fraction form
    687.93/1,031.99 = 255.05/x
  3. Step 3: Cross multiply
    687.93x = 1,031.99 × 255.05
  4. Step 4: Simplify right side
    687.93x = 263,209.05
  5. Step 5: Solve for x
    x = 263,209.05/687.93
  6. Step 6: Final answer
    x = 382.61

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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.