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Finding the Fourth Proportional to 353.50, 488.10 and 280.20

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Solution

The fourth proportional to 353.50, 488.10 and 280.20 is: 386.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.50 : 488.10 = 280.20 : x
  2. Step 2: Convert to fraction form
    353.50/488.10 = 280.20/x
  3. Step 3: Cross multiply
    353.50x = 488.10 × 280.20
  4. Step 4: Simplify right side
    353.50x = 136,765.62
  5. Step 5: Solve for x
    x = 136,765.62/353.50
  6. Step 6: Final answer
    x = 386.89

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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.