Home / 2,161.11-3,238.85-990.69

Finding the Fourth Proportional to 2,161.11, 3,238.85 and 990.69

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Solution

The fourth proportional to 2,161.11, 3,238.85 and 990.69 is: 1,484.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.11 : 3,238.85 = 990.69 : x
  2. Step 2: Convert to fraction form
    2,161.11/3,238.85 = 990.69/x
  3. Step 3: Cross multiply
    2,161.11x = 3,238.85 × 990.69
  4. Step 4: Simplify right side
    2,161.11x = 3,208,691.35
  5. Step 5: Solve for x
    x = 3,208,691.35/2,161.11
  6. Step 6: Final answer
    x = 1,484.74

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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.