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Finding the Fourth Proportional to 146.10, 219.23 and 85.20

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Solution

The fourth proportional to 146.10, 219.23 and 85.20 is: 127.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.10 : 219.23 = 85.20 : x
  2. Step 2: Convert to fraction form
    146.10/219.23 = 85.20/x
  3. Step 3: Cross multiply
    146.10x = 219.23 × 85.20
  4. Step 4: Simplify right side
    146.10x = 18,678.94
  5. Step 5: Solve for x
    x = 18,678.94/146.10
  6. Step 6: Final answer
    x = 127.85

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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.