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Finding the Fourth Proportional to 386.34, 533.43 and 308.94

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Solution

The fourth proportional to 386.34, 533.43 and 308.94 is: 426.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.34 : 533.43 = 308.94 : x
  2. Step 2: Convert to fraction form
    386.34/533.43 = 308.94/x
  3. Step 3: Cross multiply
    386.34x = 533.43 × 308.94
  4. Step 4: Simplify right side
    386.34x = 164,797.86
  5. Step 5: Solve for x
    x = 164,797.86/386.34
  6. Step 6: Final answer
    x = 426.56

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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.