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Finding the Fourth Proportional to 442.50, 663.25 and 211.20

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Solution

The fourth proportional to 442.50, 663.25 and 211.20 is: 316.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.50 : 663.25 = 211.20 : x
  2. Step 2: Convert to fraction form
    442.50/663.25 = 211.20/x
  3. Step 3: Cross multiply
    442.50x = 663.25 × 211.20
  4. Step 4: Simplify right side
    442.50x = 140,074.03
  5. Step 5: Solve for x
    x = 140,074.03/442.50
  6. Step 6: Final answer
    x = 316.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.