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Finding the Fourth Proportional to 747.15, 1,031.67 and 668.33

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Solution

The fourth proportional to 747.15, 1,031.67 and 668.33 is: 922.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.15 : 1,031.67 = 668.33 : x
  2. Step 2: Convert to fraction form
    747.15/1,031.67 = 668.33/x
  3. Step 3: Cross multiply
    747.15x = 1,031.67 × 668.33
  4. Step 4: Simplify right side
    747.15x = 689,490.85
  5. Step 5: Solve for x
    x = 689,490.85/747.15
  6. Step 6: Final answer
    x = 922.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.