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Finding the Fourth Proportional to 265.38, 397.59 and 128.23

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Solution

The fourth proportional to 265.38, 397.59 and 128.23 is: 192.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.38 : 397.59 = 128.23 : x
  2. Step 2: Convert to fraction form
    265.38/397.59 = 128.23/x
  3. Step 3: Cross multiply
    265.38x = 397.59 × 128.23
  4. Step 4: Simplify right side
    265.38x = 50,982.97
  5. Step 5: Solve for x
    x = 50,982.97/265.38
  6. Step 6: Final answer
    x = 192.11

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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.