Home / 1,288.32-1,932.09-422.43

Finding the Fourth Proportional to 1,288.32, 1,932.09 and 422.43

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Solution

The fourth proportional to 1,288.32, 1,932.09 and 422.43 is: 633.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.32 : 1,932.09 = 422.43 : x
  2. Step 2: Convert to fraction form
    1,288.32/1,932.09 = 422.43/x
  3. Step 3: Cross multiply
    1,288.32x = 1,932.09 × 422.43
  4. Step 4: Simplify right side
    1,288.32x = 816,172.78
  5. Step 5: Solve for x
    x = 816,172.78/1,288.32
  6. Step 6: Final answer
    x = 633.52

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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.