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Finding the Fourth Proportional to 146.18, 201.45 and 128.54

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Solution

The fourth proportional to 146.18, 201.45 and 128.54 is: 177.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.18 : 201.45 = 128.54 : x
  2. Step 2: Convert to fraction form
    146.18/201.45 = 128.54/x
  3. Step 3: Cross multiply
    146.18x = 201.45 × 128.54
  4. Step 4: Simplify right side
    146.18x = 25,894.38
  5. Step 5: Solve for x
    x = 25,894.38/146.18
  6. Step 6: Final answer
    x = 177.14

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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.