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Finding the Fourth Proportional to 159.81, 239.73 and 78.63

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Solution

The fourth proportional to 159.81, 239.73 and 78.63 is: 117.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.81 : 239.73 = 78.63 : x
  2. Step 2: Convert to fraction form
    159.81/239.73 = 78.63/x
  3. Step 3: Cross multiply
    159.81x = 239.73 × 78.63
  4. Step 4: Simplify right side
    159.81x = 18,849.97
  5. Step 5: Solve for x
    x = 18,849.97/159.81
  6. Step 6: Final answer
    x = 117.95

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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.