Home / 1,081.08-1,491.90-998.40

Finding the Fourth Proportional to 1,081.08, 1,491.90 and 998.40

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Solution

The fourth proportional to 1,081.08, 1,491.90 and 998.40 is: 1,377.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.08 : 1,491.90 = 998.40 : x
  2. Step 2: Convert to fraction form
    1,081.08/1,491.90 = 998.40/x
  3. Step 3: Cross multiply
    1,081.08x = 1,491.90 × 998.40
  4. Step 4: Simplify right side
    1,081.08x = 1,489,512.96
  5. Step 5: Solve for x
    x = 1,489,512.96/1,081.08
  6. Step 6: Final answer
    x = 1,377.80

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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.