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Finding the Fourth Proportional to 499.28, 689.31 and 324.90

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Solution

The fourth proportional to 499.28, 689.31 and 324.90 is: 448.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.28 : 689.31 = 324.90 : x
  2. Step 2: Convert to fraction form
    499.28/689.31 = 324.90/x
  3. Step 3: Cross multiply
    499.28x = 689.31 × 324.90
  4. Step 4: Simplify right side
    499.28x = 223,956.82
  5. Step 5: Solve for x
    x = 223,956.82/499.28
  6. Step 6: Final answer
    x = 448.56

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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.