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Finding the Fourth Proportional to 721.34, 993.38 and 676.85

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Solution

The fourth proportional to 721.34, 993.38 and 676.85 is: 932.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.34 : 993.38 = 676.85 : x
  2. Step 2: Convert to fraction form
    721.34/993.38 = 676.85/x
  3. Step 3: Cross multiply
    721.34x = 993.38 × 676.85
  4. Step 4: Simplify right side
    721.34x = 672,360.90
  5. Step 5: Solve for x
    x = 672,360.90/721.34
  6. Step 6: Final answer
    x = 932.11

Related Problems

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Half scale
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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.