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Finding the Fourth Proportional to 146.78, 202.72 and 115.66

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Solution

The fourth proportional to 146.78, 202.72 and 115.66 is: 159.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.78 : 202.72 = 115.66 : x
  2. Step 2: Convert to fraction form
    146.78/202.72 = 115.66/x
  3. Step 3: Cross multiply
    146.78x = 202.72 × 115.66
  4. Step 4: Simplify right side
    146.78x = 23,446.60
  5. Step 5: Solve for x
    x = 23,446.60/146.78
  6. Step 6: Final answer
    x = 159.74

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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.