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Finding the Fourth Proportional to 232.88, 321.20 and 155.28

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Solution

The fourth proportional to 232.88, 321.20 and 155.28 is: 214.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    232.88 : 321.20 = 155.28 : x
  2. Step 2: Convert to fraction form
    232.88/321.20 = 155.28/x
  3. Step 3: Cross multiply
    232.88x = 321.20 × 155.28
  4. Step 4: Simplify right side
    232.88x = 49,875.94
  5. Step 5: Solve for x
    x = 49,875.94/232.88
  6. Step 6: Final answer
    x = 214.17

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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.