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Finding the Fourth Proportional to 2,121.83, 3,182.84 and 660.95

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Solution

The fourth proportional to 2,121.83, 3,182.84 and 660.95 is: 991.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.83 : 3,182.84 = 660.95 : x
  2. Step 2: Convert to fraction form
    2,121.83/3,182.84 = 660.95/x
  3. Step 3: Cross multiply
    2,121.83x = 3,182.84 × 660.95
  4. Step 4: Simplify right side
    2,121.83x = 2,103,698.10
  5. Step 5: Solve for x
    x = 2,103,698.10/2,121.83
  6. Step 6: Final answer
    x = 991.45

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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.