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Finding the Fourth Proportional to 387.38, 533.34 and 331.26

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Solution

The fourth proportional to 387.38, 533.34 and 331.26 is: 456.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.38 : 533.34 = 331.26 : x
  2. Step 2: Convert to fraction form
    387.38/533.34 = 331.26/x
  3. Step 3: Cross multiply
    387.38x = 533.34 × 331.26
  4. Step 4: Simplify right side
    387.38x = 176,674.21
  5. Step 5: Solve for x
    x = 176,674.21/387.38
  6. Step 6: Final answer
    x = 456.08

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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.