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Finding the Fourth Proportional to 1,347.05, 2,020.76 and 422.43

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Solution

The fourth proportional to 1,347.05, 2,020.76 and 422.43 is: 633.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.05 : 2,020.76 = 422.43 : x
  2. Step 2: Convert to fraction form
    1,347.05/2,020.76 = 422.43/x
  3. Step 3: Cross multiply
    1,347.05x = 2,020.76 × 422.43
  4. Step 4: Simplify right side
    1,347.05x = 853,630.70
  5. Step 5: Solve for x
    x = 853,630.70/1,347.05
  6. Step 6: Final answer
    x = 633.71

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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.