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Finding the Fourth Proportional to 232.07, 320.25 and 128.57

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Solution

The fourth proportional to 232.07, 320.25 and 128.57 is: 177.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    232.07 : 320.25 = 128.57 : x
  2. Step 2: Convert to fraction form
    232.07/320.25 = 128.57/x
  3. Step 3: Cross multiply
    232.07x = 320.25 × 128.57
  4. Step 4: Simplify right side
    232.07x = 41,172.30
  5. Step 5: Solve for x
    x = 41,172.30/232.07
  6. Step 6: Final answer
    x = 177.42

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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.