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Finding the Fourth Proportional to 725.88, 1,000.95 and 668.91

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Solution

The fourth proportional to 725.88, 1,000.95 and 668.91 is: 922.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.88 : 1,000.95 = 668.91 : x
  2. Step 2: Convert to fraction form
    725.88/1,000.95 = 668.91/x
  3. Step 3: Cross multiply
    725.88x = 1,000.95 × 668.91
  4. Step 4: Simplify right side
    725.88x = 669,545.46
  5. Step 5: Solve for x
    x = 669,545.46/725.88
  6. Step 6: Final answer
    x = 922.39

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1.5x scale

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.