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Finding the Fourth Proportional to 159.19, 238.55 and 78.09

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Solution

The fourth proportional to 159.19, 238.55 and 78.09 is: 117.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.19 : 238.55 = 78.09 : x
  2. Step 2: Convert to fraction form
    159.19/238.55 = 78.09/x
  3. Step 3: Cross multiply
    159.19x = 238.55 × 78.09
  4. Step 4: Simplify right side
    159.19x = 18,627.38
  5. Step 5: Solve for x
    x = 18,627.38/159.19
  6. Step 6: Final answer
    x = 117.02

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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.