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Finding the Fourth Proportional to 401.49, 553.41 and 308.07

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Solution

The fourth proportional to 401.49, 553.41 and 308.07 is: 424.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.49 : 553.41 = 308.07 : x
  2. Step 2: Convert to fraction form
    401.49/553.41 = 308.07/x
  3. Step 3: Cross multiply
    401.49x = 553.41 × 308.07
  4. Step 4: Simplify right side
    401.49x = 170,489.02
  5. Step 5: Solve for x
    x = 170,489.02/401.49
  6. Step 6: Final answer
    x = 424.64

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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.