Home / 1,391.24-2,086.96-1,321.17

Finding the Fourth Proportional to 1,391.24, 2,086.96 and 1,321.17

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Solution

The fourth proportional to 1,391.24, 2,086.96 and 1,321.17 is: 1,981.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.24 : 2,086.96 = 1,321.17 : x
  2. Step 2: Convert to fraction form
    1,391.24/2,086.96 = 1,321.17/x
  3. Step 3: Cross multiply
    1,391.24x = 2,086.96 × 1,321.17
  4. Step 4: Simplify right side
    1,391.24x = 2,757,222.34
  5. Step 5: Solve for x
    x = 2,757,222.34/1,391.24
  6. Step 6: Final answer
    x = 1,981.85

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1.5x scale

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.