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Finding the Fourth Proportional to 159.35, 239.10 and 78.25

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Solution

The fourth proportional to 159.35, 239.10 and 78.25 is: 117.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.35 : 239.10 = 78.25 : x
  2. Step 2: Convert to fraction form
    159.35/239.10 = 78.25/x
  3. Step 3: Cross multiply
    159.35x = 239.10 × 78.25
  4. Step 4: Simplify right side
    159.35x = 18,709.58
  5. Step 5: Solve for x
    x = 18,709.58/159.35
  6. Step 6: Final answer
    x = 117.41

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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.