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Finding the Fourth Proportional to 638.56, 958.24 and 313.92

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Solution

The fourth proportional to 638.56, 958.24 and 313.92 is: 471.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.56 : 958.24 = 313.92 : x
  2. Step 2: Convert to fraction form
    638.56/958.24 = 313.92/x
  3. Step 3: Cross multiply
    638.56x = 958.24 × 313.92
  4. Step 4: Simplify right side
    638.56x = 300,810.70
  5. Step 5: Solve for x
    x = 300,810.70/638.56
  6. Step 6: Final answer
    x = 471.08

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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.