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Finding the Fourth Proportional to 414.47, 621.78 and 140.56

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Solution

The fourth proportional to 414.47, 621.78 and 140.56 is: 210.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.47 : 621.78 = 140.56 : x
  2. Step 2: Convert to fraction form
    414.47/621.78 = 140.56/x
  3. Step 3: Cross multiply
    414.47x = 621.78 × 140.56
  4. Step 4: Simplify right side
    414.47x = 87,397.06
  5. Step 5: Solve for x
    x = 87,397.06/414.47
  6. Step 6: Final answer
    x = 210.87

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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.