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Finding the Fourth Proportional to 721.88, 996.60 and 690.92

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Solution

The fourth proportional to 721.88, 996.60 and 690.92 is: 953.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.88 : 996.60 = 690.92 : x
  2. Step 2: Convert to fraction form
    721.88/996.60 = 690.92/x
  3. Step 3: Cross multiply
    721.88x = 996.60 × 690.92
  4. Step 4: Simplify right side
    721.88x = 688,570.87
  5. Step 5: Solve for x
    x = 688,570.87/721.88
  6. Step 6: Final answer
    x = 953.86

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Double scale
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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.