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Finding the Fourth Proportional to 402.11, 554.68 and 308.71

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Solution

The fourth proportional to 402.11, 554.68 and 308.71 is: 425.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.11 : 554.68 = 308.71 : x
  2. Step 2: Convert to fraction form
    402.11/554.68 = 308.71/x
  3. Step 3: Cross multiply
    402.11x = 554.68 × 308.71
  4. Step 4: Simplify right side
    402.11x = 171,235.26
  5. Step 5: Solve for x
    x = 171,235.26/402.11
  6. Step 6: Final answer
    x = 425.84

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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.