Home / 1,418.20-1,957.19-820.79

Finding the Fourth Proportional to 1,418.20, 1,957.19 and 820.79

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Solution

The fourth proportional to 1,418.20, 1,957.19 and 820.79 is: 1,132.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.20 : 1,957.19 = 820.79 : x
  2. Step 2: Convert to fraction form
    1,418.20/1,957.19 = 820.79/x
  3. Step 3: Cross multiply
    1,418.20x = 1,957.19 × 820.79
  4. Step 4: Simplify right side
    1,418.20x = 1,606,441.98
  5. Step 5: Solve for x
    x = 1,606,441.98/1,418.20
  6. Step 6: Final answer
    x = 1,132.73

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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.