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Finding the Fourth Proportional to 687.45, 1,031.33 and 340.97

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Solution

The fourth proportional to 687.45, 1,031.33 and 340.97 is: 511.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.45 : 1,031.33 = 340.97 : x
  2. Step 2: Convert to fraction form
    687.45/1,031.33 = 340.97/x
  3. Step 3: Cross multiply
    687.45x = 1,031.33 × 340.97
  4. Step 4: Simplify right side
    687.45x = 351,654.32
  5. Step 5: Solve for x
    x = 351,654.32/687.45
  6. Step 6: Final answer
    x = 511.53

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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.