Home / 1,418.81-2,128.15-378.79

Finding the Fourth Proportional to 1,418.81, 2,128.15 and 378.79

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Solution

The fourth proportional to 1,418.81, 2,128.15 and 378.79 is: 568.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.81 : 2,128.15 = 378.79 : x
  2. Step 2: Convert to fraction form
    1,418.81/2,128.15 = 378.79/x
  3. Step 3: Cross multiply
    1,418.81x = 2,128.15 × 378.79
  4. Step 4: Simplify right side
    1,418.81x = 806,121.94
  5. Step 5: Solve for x
    x = 806,121.94/1,418.81
  6. Step 6: Final answer
    x = 568.17

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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.