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Finding the Fourth Proportional to 159.36, 238.95 and 78.15

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Solution

The fourth proportional to 159.36, 238.95 and 78.15 is: 117.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.36 : 238.95 = 78.15 : x
  2. Step 2: Convert to fraction form
    159.36/238.95 = 78.15/x
  3. Step 3: Cross multiply
    159.36x = 238.95 × 78.15
  4. Step 4: Simplify right side
    159.36x = 18,673.94
  5. Step 5: Solve for x
    x = 18,673.94/159.36
  6. Step 6: Final answer
    x = 117.18

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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.