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Finding the Fourth Proportional to 414.09, 621.18 and 391.41

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Solution

The fourth proportional to 414.09, 621.18 and 391.41 is: 587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.09 : 621.18 = 391.41 : x
  2. Step 2: Convert to fraction form
    414.09/621.18 = 391.41/x
  3. Step 3: Cross multiply
    414.09x = 621.18 × 391.41
  4. Step 4: Simplify right side
    414.09x = 243,136.06
  5. Step 5: Solve for x
    x = 243,136.06/414.09
  6. Step 6: Final answer
    x = 587.16

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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.