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Finding the Fourth Proportional to 660.20, 990.55 and 249.44

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Solution

The fourth proportional to 660.20, 990.55 and 249.44 is: 374.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.20 : 990.55 = 249.44 : x
  2. Step 2: Convert to fraction form
    660.20/990.55 = 249.44/x
  3. Step 3: Cross multiply
    660.20x = 990.55 × 249.44
  4. Step 4: Simplify right side
    660.20x = 247,082.79
  5. Step 5: Solve for x
    x = 247,082.79/660.20
  6. Step 6: Final answer
    x = 374.25

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1.5x scale

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.