Home / 1,451.03-2,002.09-979.80

Finding the Fourth Proportional to 1,451.03, 2,002.09 and 979.80

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Solution

The fourth proportional to 1,451.03, 2,002.09 and 979.80 is: 1,351.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,451.03 : 2,002.09 = 979.80 : x
  2. Step 2: Convert to fraction form
    1,451.03/2,002.09 = 979.80/x
  3. Step 3: Cross multiply
    1,451.03x = 2,002.09 × 979.80
  4. Step 4: Simplify right side
    1,451.03x = 1,961,642.88
  5. Step 5: Solve for x
    x = 1,961,642.88/1,451.03
  6. Step 6: Final answer
    x = 1,351.90

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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.