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Finding the Fourth Proportional to 143.89, 215.57 and 111.49

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Solution

The fourth proportional to 143.89, 215.57 and 111.49 is: 167.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.89 : 215.57 = 111.49 : x
  2. Step 2: Convert to fraction form
    143.89/215.57 = 111.49/x
  3. Step 3: Cross multiply
    143.89x = 215.57 × 111.49
  4. Step 4: Simplify right side
    143.89x = 24,033.34
  5. Step 5: Solve for x
    x = 24,033.34/143.89
  6. Step 6: Final answer
    x = 167.03

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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.