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Finding the Fourth Proportional to 2,199.40, 3,299.10 and 660.20

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Solution

The fourth proportional to 2,199.40, 3,299.10 and 660.20 is: 990.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,199.40 : 3,299.10 = 660.20 : x
  2. Step 2: Convert to fraction form
    2,199.40/3,299.10 = 660.20/x
  3. Step 3: Cross multiply
    2,199.40x = 3,299.10 × 660.20
  4. Step 4: Simplify right side
    2,199.40x = 2,178,065.82
  5. Step 5: Solve for x
    x = 2,178,065.82/2,199.40
  6. Step 6: Final answer
    x = 990.30

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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.