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Finding the Fourth Proportional to 143.76, 215.82 and 111.36

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Solution

The fourth proportional to 143.76, 215.82 and 111.36 is: 167.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.76 : 215.82 = 111.36 : x
  2. Step 2: Convert to fraction form
    143.76/215.82 = 111.36/x
  3. Step 3: Cross multiply
    143.76x = 215.82 × 111.36
  4. Step 4: Simplify right side
    143.76x = 24,033.72
  5. Step 5: Solve for x
    x = 24,033.72/143.76
  6. Step 6: Final answer
    x = 167.18

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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.