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Finding the Fourth Proportional to 275.29, 412.97 and 128.97

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Solution

The fourth proportional to 275.29, 412.97 and 128.97 is: 193.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.29 : 412.97 = 128.97 : x
  2. Step 2: Convert to fraction form
    275.29/412.97 = 128.97/x
  3. Step 3: Cross multiply
    275.29x = 412.97 × 128.97
  4. Step 4: Simplify right side
    275.29x = 53,258.68
  5. Step 5: Solve for x
    x = 53,258.68/275.29
  6. Step 6: Final answer
    x = 193.46

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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.