Home / 2,315.70-3,195.45-1,321.20

Finding the Fourth Proportional to 2,315.70, 3,195.45 and 1,321.20

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Solution

The fourth proportional to 2,315.70, 3,195.45 and 1,321.20 is: 1,823.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,315.70 : 3,195.45 = 1,321.20 : x
  2. Step 2: Convert to fraction form
    2,315.70/3,195.45 = 1,321.20/x
  3. Step 3: Cross multiply
    2,315.70x = 3,195.45 × 1,321.20
  4. Step 4: Simplify right side
    2,315.70x = 4,221,828.54
  5. Step 5: Solve for x
    x = 4,221,828.54/2,315.70
  6. Step 6: Final answer
    x = 1,823.13

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1.5x scale

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.