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Finding the Fourth Proportional to 258.30, 387.09 and 200.59

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Solution

The fourth proportional to 258.30, 387.09 and 200.59 is: 300.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.30 : 387.09 = 200.59 : x
  2. Step 2: Convert to fraction form
    258.30/387.09 = 200.59/x
  3. Step 3: Cross multiply
    258.30x = 387.09 × 200.59
  4. Step 4: Simplify right side
    258.30x = 77,645.42
  5. Step 5: Solve for x
    x = 77,645.42/258.30
  6. Step 6: Final answer
    x = 300.60

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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.