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Finding the Fourth Proportional to 159.88, 239.87 and 78.77

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Solution

The fourth proportional to 159.88, 239.87 and 78.77 is: 118.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.88 : 239.87 = 78.77 : x
  2. Step 2: Convert to fraction form
    159.88/239.87 = 78.77/x
  3. Step 3: Cross multiply
    159.88x = 239.87 × 78.77
  4. Step 4: Simplify right side
    159.88x = 18,895.36
  5. Step 5: Solve for x
    x = 18,895.36/159.88
  6. Step 6: Final answer
    x = 118.19

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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.