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Finding the Fourth Proportional to 2,121.57, 3,181.32 and 660.72

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Solution

The fourth proportional to 2,121.57, 3,181.32 and 660.72 is: 990.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.57 : 3,181.32 = 660.72 : x
  2. Step 2: Convert to fraction form
    2,121.57/3,181.32 = 660.72/x
  3. Step 3: Cross multiply
    2,121.57x = 3,181.32 × 660.72
  4. Step 4: Simplify right side
    2,121.57x = 2,101,961.75
  5. Step 5: Solve for x
    x = 2,101,961.75/2,121.57
  6. Step 6: Final answer
    x = 990.76

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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.