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Finding the Fourth Proportional to 723.20, 997.66 and 428.28

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Solution

The fourth proportional to 723.20, 997.66 and 428.28 is: 590.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.20 : 997.66 = 428.28 : x
  2. Step 2: Convert to fraction form
    723.20/997.66 = 428.28/x
  3. Step 3: Cross multiply
    723.20x = 997.66 × 428.28
  4. Step 4: Simplify right side
    723.20x = 427,277.82
  5. Step 5: Solve for x
    x = 427,277.82/723.20
  6. Step 6: Final answer
    x = 590.82

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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.