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Finding the Fourth Proportional to 143.91, 215.76 and 71.72

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Solution

The fourth proportional to 143.91, 215.76 and 71.72 is: 107.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.91 : 215.76 = 71.72 : x
  2. Step 2: Convert to fraction form
    143.91/215.76 = 71.72/x
  3. Step 3: Cross multiply
    143.91x = 215.76 × 71.72
  4. Step 4: Simplify right side
    143.91x = 15,474.31
  5. Step 5: Solve for x
    x = 15,474.31/143.91
  6. Step 6: Final answer
    x = 107.53

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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.