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Finding the Fourth Proportional to 976.28, 1,463.61 and 398.75

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Solution

The fourth proportional to 976.28, 1,463.61 and 398.75 is: 597.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.28 : 1,463.61 = 398.75 : x
  2. Step 2: Convert to fraction form
    976.28/1,463.61 = 398.75/x
  3. Step 3: Cross multiply
    976.28x = 1,463.61 × 398.75
  4. Step 4: Simplify right side
    976.28x = 583,614.49
  5. Step 5: Solve for x
    x = 583,614.49/976.28
  6. Step 6: Final answer
    x = 597.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.