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Finding the Fourth Proportional to 342.96, 513.36 and 239.76

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Solution

The fourth proportional to 342.96, 513.36 and 239.76 is: 358.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.96 : 513.36 = 239.76 : x
  2. Step 2: Convert to fraction form
    342.96/513.36 = 239.76/x
  3. Step 3: Cross multiply
    342.96x = 513.36 × 239.76
  4. Step 4: Simplify right side
    342.96x = 123,083.19
  5. Step 5: Solve for x
    x = 123,083.19/342.96
  6. Step 6: Final answer
    x = 358.88

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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.