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Finding the Fourth Proportional to 391.61, 538.81 and 338.99

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Solution

The fourth proportional to 391.61, 538.81 and 338.99 is: 466.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.61 : 538.81 = 338.99 : x
  2. Step 2: Convert to fraction form
    391.61/538.81 = 338.99/x
  3. Step 3: Cross multiply
    391.61x = 538.81 × 338.99
  4. Step 4: Simplify right side
    391.61x = 182,647.66
  5. Step 5: Solve for x
    x = 182,647.66/391.61
  6. Step 6: Final answer
    x = 466.40

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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.