Home / 1,121.11-1,682.15-427.85

Finding the Fourth Proportional to 1,121.11, 1,682.15 and 427.85

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Solution

The fourth proportional to 1,121.11, 1,682.15 and 427.85 is: 641.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.11 : 1,682.15 = 427.85 : x
  2. Step 2: Convert to fraction form
    1,121.11/1,682.15 = 427.85/x
  3. Step 3: Cross multiply
    1,121.11x = 1,682.15 × 427.85
  4. Step 4: Simplify right side
    1,121.11x = 719,706.04
  5. Step 5: Solve for x
    x = 719,706.04/1,121.11
  6. Step 6: Final answer
    x = 641.96

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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.