Home / 2,121.12-3,180.42-871.34

Finding the Fourth Proportional to 2,121.12, 3,180.42 and 871.34

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Solution

The fourth proportional to 2,121.12, 3,180.42 and 871.34 is: 1,306.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.12 : 3,180.42 = 871.34 : x
  2. Step 2: Convert to fraction form
    2,121.12/3,180.42 = 871.34/x
  3. Step 3: Cross multiply
    2,121.12x = 3,180.42 × 871.34
  4. Step 4: Simplify right side
    2,121.12x = 2,771,235.11
  5. Step 5: Solve for x
    x = 2,771,235.11/2,121.12
  6. Step 6: Final answer
    x = 1,306.50

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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.