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Finding the Fourth Proportional to 353.70, 488.20 and 206.30

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Solution

The fourth proportional to 353.70, 488.20 and 206.30 is: 284.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.70 : 488.20 = 206.30 : x
  2. Step 2: Convert to fraction form
    353.70/488.20 = 206.30/x
  3. Step 3: Cross multiply
    353.70x = 488.20 × 206.30
  4. Step 4: Simplify right side
    353.70x = 100,715.66
  5. Step 5: Solve for x
    x = 100,715.66/353.70
  6. Step 6: Final answer
    x = 284.75

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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.