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Finding the Fourth Proportional to 451.22, 621.34 and 418.55

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Solution

The fourth proportional to 451.22, 621.34 and 418.55 is: 576.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.22 : 621.34 = 418.55 : x
  2. Step 2: Convert to fraction form
    451.22/621.34 = 418.55/x
  3. Step 3: Cross multiply
    451.22x = 621.34 × 418.55
  4. Step 4: Simplify right side
    451.22x = 260,057.70
  5. Step 5: Solve for x
    x = 260,057.70/451.22
  6. Step 6: Final answer
    x = 576.35

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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.