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Finding the Fourth Proportional to 543.40, 815.70 and 422.20

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Solution

The fourth proportional to 543.40, 815.70 and 422.20 is: 633.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.40 : 815.70 = 422.20 : x
  2. Step 2: Convert to fraction form
    543.40/815.70 = 422.20/x
  3. Step 3: Cross multiply
    543.40x = 815.70 × 422.20
  4. Step 4: Simplify right side
    543.40x = 344,388.54
  5. Step 5: Solve for x
    x = 344,388.54/543.40
  6. Step 6: Final answer
    x = 633.77

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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.