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Finding the Fourth Proportional to 418.58, 628.00 and 140.95

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Solution

The fourth proportional to 418.58, 628.00 and 140.95 is: 211.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.58 : 628.00 = 140.95 : x
  2. Step 2: Convert to fraction form
    418.58/628.00 = 140.95/x
  3. Step 3: Cross multiply
    418.58x = 628.00 × 140.95
  4. Step 4: Simplify right side
    418.58x = 88,517.03
  5. Step 5: Solve for x
    x = 88,517.03/418.58
  6. Step 6: Final answer
    x = 211.47

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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.