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Finding the Fourth Proportional to 265.38, 398.28 and 128.46

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Solution

The fourth proportional to 265.38, 398.28 and 128.46 is: 192.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.38 : 398.28 = 128.46 : x
  2. Step 2: Convert to fraction form
    265.38/398.28 = 128.46/x
  3. Step 3: Cross multiply
    265.38x = 398.28 × 128.46
  4. Step 4: Simplify right side
    265.38x = 51,163.05
  5. Step 5: Solve for x
    x = 51,163.05/265.38
  6. Step 6: Final answer
    x = 192.79

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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.