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Finding the Fourth Proportional to 721.13, 996.35 and 693.78

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Solution

The fourth proportional to 721.13, 996.35 and 693.78 is: 958.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.13 : 996.35 = 693.78 : x
  2. Step 2: Convert to fraction form
    721.13/996.35 = 693.78/x
  3. Step 3: Cross multiply
    721.13x = 996.35 × 693.78
  4. Step 4: Simplify right side
    721.13x = 691,244.23
  5. Step 5: Solve for x
    x = 691,244.23/721.13
  6. Step 6: Final answer
    x = 958.56

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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.