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Finding the Fourth Proportional to 348.38, 480.45 and 217.40

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Solution

The fourth proportional to 348.38, 480.45 and 217.40 is: 299.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.38 : 480.45 = 217.40 : x
  2. Step 2: Convert to fraction form
    348.38/480.45 = 217.40/x
  3. Step 3: Cross multiply
    348.38x = 480.45 × 217.40
  4. Step 4: Simplify right side
    348.38x = 104,449.83
  5. Step 5: Solve for x
    x = 104,449.83/348.38
  6. Step 6: Final answer
    x = 299.82

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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.