Home / 5,138.88-7,708.62-1,391.22

Finding the Fourth Proportional to 5,138.88, 7,708.62 and 1,391.22

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Solution

The fourth proportional to 5,138.88, 7,708.62 and 1,391.22 is: 2,086.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.88 : 7,708.62 = 1,391.22 : x
  2. Step 2: Convert to fraction form
    5,138.88/7,708.62 = 1,391.22/x
  3. Step 3: Cross multiply
    5,138.88x = 7,708.62 × 1,391.22
  4. Step 4: Simplify right side
    5,138.88x = 10,724,386.32
  5. Step 5: Solve for x
    x = 10,724,386.32/5,138.88
  6. Step 6: Final answer
    x = 2,086.91

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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.