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Finding the Fourth Proportional to 159.48, 239.25 and 78.30

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Solution

The fourth proportional to 159.48, 239.25 and 78.30 is: 117.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.48 : 239.25 = 78.30 : x
  2. Step 2: Convert to fraction form
    159.48/239.25 = 78.30/x
  3. Step 3: Cross multiply
    159.48x = 239.25 × 78.30
  4. Step 4: Simplify right side
    159.48x = 18,733.28
  5. Step 5: Solve for x
    x = 18,733.28/159.48
  6. Step 6: Final answer
    x = 117.46

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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.