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Finding the Fourth Proportional to 414.38, 571.70 and 239.70

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Solution

The fourth proportional to 414.38, 571.70 and 239.70 is: 330.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.38 : 571.70 = 239.70 : x
  2. Step 2: Convert to fraction form
    414.38/571.70 = 239.70/x
  3. Step 3: Cross multiply
    414.38x = 571.70 × 239.70
  4. Step 4: Simplify right side
    414.38x = 137,036.49
  5. Step 5: Solve for x
    x = 137,036.49/414.38
  6. Step 6: Final answer
    x = 330.70

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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.