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Finding the Fourth Proportional to 146.56, 220.60 and 128.92

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Solution

The fourth proportional to 146.56, 220.60 and 128.92 is: 194.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.56 : 220.60 = 128.92 : x
  2. Step 2: Convert to fraction form
    146.56/220.60 = 128.92/x
  3. Step 3: Cross multiply
    146.56x = 220.60 × 128.92
  4. Step 4: Simplify right side
    146.56x = 28,439.75
  5. Step 5: Solve for x
    x = 28,439.75/146.56
  6. Step 6: Final answer
    x = 194.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.