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Finding the Fourth Proportional to 348.42, 480.74 and 215.70

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Solution

The fourth proportional to 348.42, 480.74 and 215.70 is: 297.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.42 : 480.74 = 215.70 : x
  2. Step 2: Convert to fraction form
    348.42/480.74 = 215.70/x
  3. Step 3: Cross multiply
    348.42x = 480.74 × 215.70
  4. Step 4: Simplify right side
    348.42x = 103,695.62
  5. Step 5: Solve for x
    x = 103,695.62/348.42
  6. Step 6: Final answer
    x = 297.62

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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.