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Finding the Fourth Proportional to 2,988.92, 4,479.78 and 2,161.46

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Solution

The fourth proportional to 2,988.92, 4,479.78 and 2,161.46 is: 3,239.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,988.92 : 4,479.78 = 2,161.46 : x
  2. Step 2: Convert to fraction form
    2,988.92/4,479.78 = 2,161.46/x
  3. Step 3: Cross multiply
    2,988.92x = 4,479.78 × 2,161.46
  4. Step 4: Simplify right side
    2,988.92x = 9,682,865.28
  5. Step 5: Solve for x
    x = 9,682,865.28/2,988.92
  6. Step 6: Final answer
    x = 3,239.59

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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.