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Finding the Fourth Proportional to 159.96, 239.88 and 78.75

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Solution

The fourth proportional to 159.96, 239.88 and 78.75 is: 118.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.96 : 239.88 = 78.75 : x
  2. Step 2: Convert to fraction form
    159.96/239.88 = 78.75/x
  3. Step 3: Cross multiply
    159.96x = 239.88 × 78.75
  4. Step 4: Simplify right side
    159.96x = 18,890.55
  5. Step 5: Solve for x
    x = 18,890.55/159.96
  6. Step 6: Final answer
    x = 118.10

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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.