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Finding the Fourth Proportional to 665.20, 997.60 and 275.19

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Solution

The fourth proportional to 665.20, 997.60 and 275.19 is: 412.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.20 : 997.60 = 275.19 : x
  2. Step 2: Convert to fraction form
    665.20/997.60 = 275.19/x
  3. Step 3: Cross multiply
    665.20x = 997.60 × 275.19
  4. Step 4: Simplify right side
    665.20x = 274,529.54
  5. Step 5: Solve for x
    x = 274,529.54/665.20
  6. Step 6: Final answer
    x = 412.70

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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.