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Finding the Fourth Proportional to 439.19, 657.42 and 323.76

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Solution

The fourth proportional to 439.19, 657.42 and 323.76 is: 484.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.19 : 657.42 = 323.76 : x
  2. Step 2: Convert to fraction form
    439.19/657.42 = 323.76/x
  3. Step 3: Cross multiply
    439.19x = 657.42 × 323.76
  4. Step 4: Simplify right side
    439.19x = 212,847.55
  5. Step 5: Solve for x
    x = 212,847.55/439.19
  6. Step 6: Final answer
    x = 484.64

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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.