Home / 1,391.28-1,919.93-801.87

Finding the Fourth Proportional to 1,391.28, 1,919.93 and 801.87

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Solution

The fourth proportional to 1,391.28, 1,919.93 and 801.87 is: 1,106.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.28 : 1,919.93 = 801.87 : x
  2. Step 2: Convert to fraction form
    1,391.28/1,919.93 = 801.87/x
  3. Step 3: Cross multiply
    1,391.28x = 1,919.93 × 801.87
  4. Step 4: Simplify right side
    1,391.28x = 1,539,524.67
  5. Step 5: Solve for x
    x = 1,539,524.67/1,391.28
  6. Step 6: Final answer
    x = 1,106.56

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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.