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Finding the Fourth Proportional to 687.89, 1,031.86 and 225.69

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Solution

The fourth proportional to 687.89, 1,031.86 and 225.69 is: 338.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.89 : 1,031.86 = 225.69 : x
  2. Step 2: Convert to fraction form
    687.89/1,031.86 = 225.69/x
  3. Step 3: Cross multiply
    687.89x = 1,031.86 × 225.69
  4. Step 4: Simplify right side
    687.89x = 232,880.48
  5. Step 5: Solve for x
    x = 232,880.48/687.89
  6. Step 6: Final answer
    x = 338.55

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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.