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Finding the Fourth Proportional to 146.28, 219.35 and 85.43

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Solution

The fourth proportional to 146.28, 219.35 and 85.43 is: 128.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.28 : 219.35 = 85.43 : x
  2. Step 2: Convert to fraction form
    146.28/219.35 = 85.43/x
  3. Step 3: Cross multiply
    146.28x = 219.35 × 85.43
  4. Step 4: Simplify right side
    146.28x = 18,737.97
  5. Step 5: Solve for x
    x = 18,737.97/146.28
  6. Step 6: Final answer
    x = 128.10

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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.