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Finding the Fourth Proportional to 313.92, 432.96 and 231.12

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Solution

The fourth proportional to 313.92, 432.96 and 231.12 is: 318.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.92 : 432.96 = 231.12 : x
  2. Step 2: Convert to fraction form
    313.92/432.96 = 231.12/x
  3. Step 3: Cross multiply
    313.92x = 432.96 × 231.12
  4. Step 4: Simplify right side
    313.92x = 100,065.72
  5. Step 5: Solve for x
    x = 100,065.72/313.92
  6. Step 6: Final answer
    x = 318.76

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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.