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Finding the Fourth Proportional to 386.73, 533.81 and 308.18

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Solution

The fourth proportional to 386.73, 533.81 and 308.18 is: 425.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.73 : 533.81 = 308.18 : x
  2. Step 2: Convert to fraction form
    386.73/533.81 = 308.18/x
  3. Step 3: Cross multiply
    386.73x = 533.81 × 308.18
  4. Step 4: Simplify right side
    386.73x = 164,508.02
  5. Step 5: Solve for x
    x = 164,508.02/386.73
  6. Step 6: Final answer
    x = 425.38

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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.