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Finding the Fourth Proportional to 723, 997.68 and 428.20

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Solution

The fourth proportional to 723, 997.68 and 428.20 is: 590.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    723 : 997.68 = 428.20 : x
  2. Step 2: Convert to fraction form
    723/997.68 = 428.20/x
  3. Step 3: Cross multiply
    723x = 997.68 × 428.20
  4. Step 4: Simplify right side
    723x = 427,206.58
  5. Step 5: Solve for x
    x = 427,206.58/723
  6. Step 6: Final answer
    x = 590.88

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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.