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Finding the Fourth Proportional to 2,144.80, 3,216.68 and 989.44

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Solution

The fourth proportional to 2,144.80, 3,216.68 and 989.44 is: 1,483.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,144.80 : 3,216.68 = 989.44 : x
  2. Step 2: Convert to fraction form
    2,144.80/3,216.68 = 989.44/x
  3. Step 3: Cross multiply
    2,144.80x = 3,216.68 × 989.44
  4. Step 4: Simplify right side
    2,144.80x = 3,182,711.86
  5. Step 5: Solve for x
    x = 3,182,711.86/2,144.80
  6. Step 6: Final answer
    x = 1,483.92

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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.