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Finding the Fourth Proportional to 622.18, 857.28 and 447.22

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Solution

The fourth proportional to 622.18, 857.28 and 447.22 is: 616.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.18 : 857.28 = 447.22 : x
  2. Step 2: Convert to fraction form
    622.18/857.28 = 447.22/x
  3. Step 3: Cross multiply
    622.18x = 857.28 × 447.22
  4. Step 4: Simplify right side
    622.18x = 383,392.76
  5. Step 5: Solve for x
    x = 383,392.76/622.18
  6. Step 6: Final answer
    x = 616.21

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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.