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Finding the Fourth Proportional to 721.78, 996.10 and 427.34

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Solution

The fourth proportional to 721.78, 996.10 and 427.34 is: 589.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.78 : 996.10 = 427.34 : x
  2. Step 2: Convert to fraction form
    721.78/996.10 = 427.34/x
  3. Step 3: Cross multiply
    721.78x = 996.10 × 427.34
  4. Step 4: Simplify right side
    721.78x = 425,674.80
  5. Step 5: Solve for x
    x = 425,674.80/721.78
  6. Step 6: Final answer
    x = 589.76

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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.