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Finding the Fourth Proportional to 693.38, 1,031.90 and 667.46

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Solution

The fourth proportional to 693.38, 1,031.90 and 667.46 is: 993.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.38 : 1,031.90 = 667.46 : x
  2. Step 2: Convert to fraction form
    693.38/1,031.90 = 667.46/x
  3. Step 3: Cross multiply
    693.38x = 1,031.90 × 667.46
  4. Step 4: Simplify right side
    693.38x = 688,751.97
  5. Step 5: Solve for x
    x = 688,751.97/693.38
  6. Step 6: Final answer
    x = 993.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.