Home / 2,101.12-3,151.23-868.21

Finding the Fourth Proportional to 2,101.12, 3,151.23 and 868.21

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Solution

The fourth proportional to 2,101.12, 3,151.23 and 868.21 is: 1,302.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.12 : 3,151.23 = 868.21 : x
  2. Step 2: Convert to fraction form
    2,101.12/3,151.23 = 868.21/x
  3. Step 3: Cross multiply
    2,101.12x = 3,151.23 × 868.21
  4. Step 4: Simplify right side
    2,101.12x = 2,735,929.40
  5. Step 5: Solve for x
    x = 2,735,929.40/2,101.12
  6. Step 6: Final answer
    x = 1,302.13

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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.