Home / 1,128.14-1,691.39-387.59

Finding the Fourth Proportional to 1,128.14, 1,691.39 and 387.59

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Solution

The fourth proportional to 1,128.14, 1,691.39 and 387.59 is: 581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.14 : 1,691.39 = 387.59 : x
  2. Step 2: Convert to fraction form
    1,128.14/1,691.39 = 387.59/x
  3. Step 3: Cross multiply
    1,128.14x = 1,691.39 × 387.59
  4. Step 4: Simplify right side
    1,128.14x = 655,571.05
  5. Step 5: Solve for x
    x = 655,571.05/1,128.14
  6. Step 6: Final answer
    x = 581.11

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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.