Home / 1,219.40-1,680.66-826.28

Finding the Fourth Proportional to 1,219.40, 1,680.66 and 826.28

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Solution

The fourth proportional to 1,219.40, 1,680.66 and 826.28 is: 1,138.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.40 : 1,680.66 = 826.28 : x
  2. Step 2: Convert to fraction form
    1,219.40/1,680.66 = 826.28/x
  3. Step 3: Cross multiply
    1,219.40x = 1,680.66 × 826.28
  4. Step 4: Simplify right side
    1,219.40x = 1,388,695.74
  5. Step 5: Solve for x
    x = 1,388,695.74/1,219.40
  6. Step 6: Final answer
    x = 1,138.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.