Home / 1,121.12-1,680.84-682.46

Finding the Fourth Proportional to 1,121.12, 1,680.84 and 682.46

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Solution

The fourth proportional to 1,121.12, 1,680.84 and 682.46 is: 1,023.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.12 : 1,680.84 = 682.46 : x
  2. Step 2: Convert to fraction form
    1,121.12/1,680.84 = 682.46/x
  3. Step 3: Cross multiply
    1,121.12x = 1,680.84 × 682.46
  4. Step 4: Simplify right side
    1,121.12x = 1,147,106.07
  5. Step 5: Solve for x
    x = 1,147,106.07/1,121.12
  6. Step 6: Final answer
    x = 1,023.18

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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.