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Finding the Fourth Proportional to 159.41, 239.06 and 78.21

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Solution

The fourth proportional to 159.41, 239.06 and 78.21 is: 117.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.41 : 239.06 = 78.21 : x
  2. Step 2: Convert to fraction form
    159.41/239.06 = 78.21/x
  3. Step 3: Cross multiply
    159.41x = 239.06 × 78.21
  4. Step 4: Simplify right side
    159.41x = 18,697.08
  5. Step 5: Solve for x
    x = 18,697.08/159.41
  6. Step 6: Final answer
    x = 117.29

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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.