Home / 1,347.20-2,021.13-422.72

Finding the Fourth Proportional to 1,347.20, 2,021.13 and 422.72

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Solution

The fourth proportional to 1,347.20, 2,021.13 and 422.72 is: 634.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.20 : 2,021.13 = 422.72 : x
  2. Step 2: Convert to fraction form
    1,347.20/2,021.13 = 422.72/x
  3. Step 3: Cross multiply
    1,347.20x = 2,021.13 × 422.72
  4. Step 4: Simplify right side
    1,347.20x = 854,361.97
  5. Step 5: Solve for x
    x = 854,361.97/1,347.20
  6. Step 6: Final answer
    x = 634.18

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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.