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Finding the Fourth Proportional to 348.55, 480.72 and 278.61

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Solution

The fourth proportional to 348.55, 480.72 and 278.61 is: 384.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.55 : 480.72 = 278.61 : x
  2. Step 2: Convert to fraction form
    348.55/480.72 = 278.61/x
  3. Step 3: Cross multiply
    348.55x = 480.72 × 278.61
  4. Step 4: Simplify right side
    348.55x = 133,933.40
  5. Step 5: Solve for x
    x = 133,933.40/348.55
  6. Step 6: Final answer
    x = 384.26

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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.