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Finding the Fourth Proportional to 159.91, 239.87 and 139.17

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Solution

The fourth proportional to 159.91, 239.87 and 139.17 is: 208.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.91 : 239.87 = 139.17 : x
  2. Step 2: Convert to fraction form
    159.91/239.87 = 139.17/x
  3. Step 3: Cross multiply
    159.91x = 239.87 × 139.17
  4. Step 4: Simplify right side
    159.91x = 33,380.81
  5. Step 5: Solve for x
    x = 33,380.81/159.91
  6. Step 6: Final answer
    x = 208.75

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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.