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Finding the Fourth Proportional to 146.25, 219.42 and 77.76

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Solution

The fourth proportional to 146.25, 219.42 and 77.76 is: 116.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.25 : 219.42 = 77.76 : x
  2. Step 2: Convert to fraction form
    146.25/219.42 = 77.76/x
  3. Step 3: Cross multiply
    146.25x = 219.42 × 77.76
  4. Step 4: Simplify right side
    146.25x = 17,062.10
  5. Step 5: Solve for x
    x = 17,062.10/146.25
  6. Step 6: Final answer
    x = 116.66

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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.