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Finding the Fourth Proportional to 159.29, 238.81 and 143.72

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Solution

The fourth proportional to 159.29, 238.81 and 143.72 is: 215.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.29 : 238.81 = 143.72 : x
  2. Step 2: Convert to fraction form
    159.29/238.81 = 143.72/x
  3. Step 3: Cross multiply
    159.29x = 238.81 × 143.72
  4. Step 4: Simplify right side
    159.29x = 34,321.77
  5. Step 5: Solve for x
    x = 34,321.77/159.29
  6. Step 6: Final answer
    x = 215.47

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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.