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Finding the Fourth Proportional to 2,121.39, 3,182.39 and 660.69

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Solution

The fourth proportional to 2,121.39, 3,182.39 and 660.69 is: 991.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.39 : 3,182.39 = 660.69 : x
  2. Step 2: Convert to fraction form
    2,121.39/3,182.39 = 660.69/x
  3. Step 3: Cross multiply
    2,121.39x = 3,182.39 × 660.69
  4. Step 4: Simplify right side
    2,121.39x = 2,102,572.42
  5. Step 5: Solve for x
    x = 2,102,572.42/2,121.39
  6. Step 6: Final answer
    x = 991.13

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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.