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Finding the Fourth Proportional to 146.30, 219.69 and 85.80

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Solution

The fourth proportional to 146.30, 219.69 and 85.80 is: 128.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.30 : 219.69 = 85.80 : x
  2. Step 2: Convert to fraction form
    146.30/219.69 = 85.80/x
  3. Step 3: Cross multiply
    146.30x = 219.69 × 85.80
  4. Step 4: Simplify right side
    146.30x = 18,849.40
  5. Step 5: Solve for x
    x = 18,849.40/146.30
  6. Step 6: Final answer
    x = 128.85

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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.