Home / 1,451.15-2,001.38-891.21

Finding the Fourth Proportional to 1,451.15, 2,001.38 and 891.21

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Solution

The fourth proportional to 1,451.15, 2,001.38 and 891.21 is: 1,229.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,451.15 : 2,001.38 = 891.21 : x
  2. Step 2: Convert to fraction form
    1,451.15/2,001.38 = 891.21/x
  3. Step 3: Cross multiply
    1,451.15x = 2,001.38 × 891.21
  4. Step 4: Simplify right side
    1,451.15x = 1,783,645.41
  5. Step 5: Solve for x
    x = 1,783,645.41/1,451.15
  6. Step 6: Final answer
    x = 1,229.13

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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.