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Finding the Fourth Proportional to 401.70, 553.50 and 308.44

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Solution

The fourth proportional to 401.70, 553.50 and 308.44 is: 425.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.70 : 553.50 = 308.44 : x
  2. Step 2: Convert to fraction form
    401.70/553.50 = 308.44/x
  3. Step 3: Cross multiply
    401.70x = 553.50 × 308.44
  4. Step 4: Simplify right side
    401.70x = 170,721.54
  5. Step 5: Solve for x
    x = 170,721.54/401.70
  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.