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Finding the Fourth Proportional to 628.21, 867.22 and 418.73

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Solution

The fourth proportional to 628.21, 867.22 and 418.73 is: 578.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.21 : 867.22 = 418.73 : x
  2. Step 2: Convert to fraction form
    628.21/867.22 = 418.73/x
  3. Step 3: Cross multiply
    628.21x = 867.22 × 418.73
  4. Step 4: Simplify right side
    628.21x = 363,133.50
  5. Step 5: Solve for x
    x = 363,133.50/628.21
  6. Step 6: Final answer
    x = 578.05

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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.