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Finding the Fourth Proportional to 143.25, 215.85 and 119.40

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Solution

The fourth proportional to 143.25, 215.85 and 119.40 is: 179.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.25 : 215.85 = 119.40 : x
  2. Step 2: Convert to fraction form
    143.25/215.85 = 119.40/x
  3. Step 3: Cross multiply
    143.25x = 215.85 × 119.40
  4. Step 4: Simplify right side
    143.25x = 25,772.49
  5. Step 5: Solve for x
    x = 25,772.49/143.25
  6. Step 6: Final answer
    x = 179.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.