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Finding the Fourth Proportional to 401.69, 553.51 and 308.43

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Solution

The fourth proportional to 401.69, 553.51 and 308.43 is: 425.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.69 : 553.51 = 308.43 : x
  2. Step 2: Convert to fraction form
    401.69/553.51 = 308.43/x
  3. Step 3: Cross multiply
    401.69x = 553.51 × 308.43
  4. Step 4: Simplify right side
    401.69x = 170,719.09
  5. Step 5: Solve for x
    x = 170,719.09/401.69
  6. Step 6: Final answer
    x = 425.00

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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.