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Finding the Fourth Proportional to 312.92, 432.20 and 239.20

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Solution

The fourth proportional to 312.92, 432.20 and 239.20 is: 330.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.92 : 432.20 = 239.20 : x
  2. Step 2: Convert to fraction form
    312.92/432.20 = 239.20/x
  3. Step 3: Cross multiply
    312.92x = 432.20 × 239.20
  4. Step 4: Simplify right side
    312.92x = 103,382.24
  5. Step 5: Solve for x
    x = 103,382.24/312.92
  6. Step 6: Final answer
    x = 330.38

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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.