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Finding the Fourth Proportional to 258.52, 387.38 and 204.28

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Solution

The fourth proportional to 258.52, 387.38 and 204.28 is: 306.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.52 : 387.38 = 204.28 : x
  2. Step 2: Convert to fraction form
    258.52/387.38 = 204.28/x
  3. Step 3: Cross multiply
    258.52x = 387.38 × 204.28
  4. Step 4: Simplify right side
    258.52x = 79,133.99
  5. Step 5: Solve for x
    x = 79,133.99/258.52
  6. Step 6: Final answer
    x = 306.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.