Home / 1,390.24-2,085.36-1,321.04

Finding the Fourth Proportional to 1,390.24, 2,085.36 and 1,321.04

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Solution

The fourth proportional to 1,390.24, 2,085.36 and 1,321.04 is: 1,981.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.24 : 2,085.36 = 1,321.04 : x
  2. Step 2: Convert to fraction form
    1,390.24/2,085.36 = 1,321.04/x
  3. Step 3: Cross multiply
    1,390.24x = 2,085.36 × 1,321.04
  4. Step 4: Simplify right side
    1,390.24x = 2,754,843.97
  5. Step 5: Solve for x
    x = 2,754,843.97/1,390.24
  6. Step 6: Final answer
    x = 1,981.56

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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.