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Finding the Fourth Proportional to 414.42, 621.49 and 140.43

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Solution

The fourth proportional to 414.42, 621.49 and 140.43 is: 210.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.42 : 621.49 = 140.43 : x
  2. Step 2: Convert to fraction form
    414.42/621.49 = 140.43/x
  3. Step 3: Cross multiply
    414.42x = 621.49 × 140.43
  4. Step 4: Simplify right side
    414.42x = 87,275.14
  5. Step 5: Solve for x
    x = 87,275.14/414.42
  6. Step 6: Final answer
    x = 210.60

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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.