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Finding the Fourth Proportional to 239.70, 330.78 and 134.82

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Solution

The fourth proportional to 239.70, 330.78 and 134.82 is: 186.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.70 : 330.78 = 134.82 : x
  2. Step 2: Convert to fraction form
    239.70/330.78 = 134.82/x
  3. Step 3: Cross multiply
    239.70x = 330.78 × 134.82
  4. Step 4: Simplify right side
    239.70x = 44,595.76
  5. Step 5: Solve for x
    x = 44,595.76/239.70
  6. Step 6: Final answer
    x = 186.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.