Home / 1,391.14-1,919.76-801.80

Finding the Fourth Proportional to 1,391.14, 1,919.76 and 801.80

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Solution

The fourth proportional to 1,391.14, 1,919.76 and 801.80 is: 1,106.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.14 : 1,919.76 = 801.80 : x
  2. Step 2: Convert to fraction form
    1,391.14/1,919.76 = 801.80/x
  3. Step 3: Cross multiply
    1,391.14x = 1,919.76 × 801.80
  4. Step 4: Simplify right side
    1,391.14x = 1,539,263.57
  5. Step 5: Solve for x
    x = 1,539,263.57/1,391.14
  6. Step 6: Final answer
    x = 1,106.48

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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.