Home / 1,421.26-2,116.92-1,331.26

Finding the Fourth Proportional to 1,421.26, 2,116.92 and 1,331.26

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Solution

The fourth proportional to 1,421.26, 2,116.92 and 1,331.26 is: 1,982.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.26 : 2,116.92 = 1,331.26 : x
  2. Step 2: Convert to fraction form
    1,421.26/2,116.92 = 1,331.26/x
  3. Step 3: Cross multiply
    1,421.26x = 2,116.92 × 1,331.26
  4. Step 4: Simplify right side
    1,421.26x = 2,818,170.92
  5. Step 5: Solve for x
    x = 2,818,170.92/1,421.26
  6. Step 6: Final answer
    x = 1,982.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.