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Finding the Fourth Proportional to 721.76, 996.15 and 427.13

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Solution

The fourth proportional to 721.76, 996.15 and 427.13 is: 589.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.76 : 996.15 = 427.13 : x
  2. Step 2: Convert to fraction form
    721.76/996.15 = 427.13/x
  3. Step 3: Cross multiply
    721.76x = 996.15 × 427.13
  4. Step 4: Simplify right side
    721.76x = 425,480.57
  5. Step 5: Solve for x
    x = 425,480.57/721.76
  6. Step 6: Final answer
    x = 589.51

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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.