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Finding the Fourth Proportional to 159.98, 239.91 and 78.77

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Solution

The fourth proportional to 159.98, 239.91 and 78.77 is: 118.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.98 : 239.91 = 78.77 : x
  2. Step 2: Convert to fraction form
    159.98/239.91 = 78.77/x
  3. Step 3: Cross multiply
    159.98x = 239.91 × 78.77
  4. Step 4: Simplify right side
    159.98x = 18,898.46
  5. Step 5: Solve for x
    x = 18,898.46/159.98
  6. Step 6: Final answer
    x = 118.13

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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.