Home / 1,391.13-1,919.97-801.54

Finding the Fourth Proportional to 1,391.13, 1,919.97 and 801.54

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Solution

The fourth proportional to 1,391.13, 1,919.97 and 801.54 is: 1,106.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.13 : 1,919.97 = 801.54 : x
  2. Step 2: Convert to fraction form
    1,391.13/1,919.97 = 801.54/x
  3. Step 3: Cross multiply
    1,391.13x = 1,919.97 × 801.54
  4. Step 4: Simplify right side
    1,391.13x = 1,538,932.75
  5. Step 5: Solve for x
    x = 1,538,932.75/1,391.13
  6. Step 6: Final answer
    x = 1,106.25

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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.