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Finding the Fourth Proportional to 621.05, 855.09 and 543.42

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Solution

The fourth proportional to 621.05, 855.09 and 543.42 is: 748.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.05 : 855.09 = 543.42 : x
  2. Step 2: Convert to fraction form
    621.05/855.09 = 543.42/x
  3. Step 3: Cross multiply
    621.05x = 855.09 × 543.42
  4. Step 4: Simplify right side
    621.05x = 464,673.01
  5. Step 5: Solve for x
    x = 464,673.01/621.05
  6. Step 6: Final answer
    x = 748.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.