Home / 1,378.80-2,067.75-454.20

Finding the Fourth Proportional to 1,378.80, 2,067.75 and 454.20

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Solution

The fourth proportional to 1,378.80, 2,067.75 and 454.20 is: 681.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.80 : 2,067.75 = 454.20 : x
  2. Step 2: Convert to fraction form
    1,378.80/2,067.75 = 454.20/x
  3. Step 3: Cross multiply
    1,378.80x = 2,067.75 × 454.20
  4. Step 4: Simplify right side
    1,378.80x = 939,172.05
  5. Step 5: Solve for x
    x = 939,172.05/1,378.80
  6. Step 6: Final answer
    x = 681.15

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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.