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Finding the Fourth Proportional to 2,140.89, 3,211.80 and 660.12

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Solution

The fourth proportional to 2,140.89, 3,211.80 and 660.12 is: 990.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.89 : 3,211.80 = 660.12 : x
  2. Step 2: Convert to fraction form
    2,140.89/3,211.80 = 660.12/x
  3. Step 3: Cross multiply
    2,140.89x = 3,211.80 × 660.12
  4. Step 4: Simplify right side
    2,140.89x = 2,120,173.42
  5. Step 5: Solve for x
    x = 2,120,173.42/2,140.89
  6. Step 6: Final answer
    x = 990.32

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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.