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Finding the Fourth Proportional to 1,347.21, 2,021.07 and 422.55

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Solution

The fourth proportional to 1,347.21, 2,021.07 and 422.55 is: 633.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.21 : 2,021.07 = 422.55 : x
  2. Step 2: Convert to fraction form
    1,347.21/2,021.07 = 422.55/x
  3. Step 3: Cross multiply
    1,347.21x = 2,021.07 × 422.55
  4. Step 4: Simplify right side
    1,347.21x = 854,003.13
  5. Step 5: Solve for x
    x = 854,003.13/1,347.21
  6. Step 6: Final answer
    x = 633.90

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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.