Home / 1,284.38-1,922.40-667.20

Finding the Fourth Proportional to 1,284.38, 1,922.40 and 667.20

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Solution

The fourth proportional to 1,284.38, 1,922.40 and 667.20 is: 998.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.38 : 1,922.40 = 667.20 : x
  2. Step 2: Convert to fraction form
    1,284.38/1,922.40 = 667.20/x
  3. Step 3: Cross multiply
    1,284.38x = 1,922.40 × 667.20
  4. Step 4: Simplify right side
    1,284.38x = 1,282,625.28
  5. Step 5: Solve for x
    x = 1,282,625.28/1,284.38
  6. Step 6: Final answer
    x = 998.64

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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.