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Finding the Fourth Proportional to 258.95, 388.19 and 137.30

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Solution

The fourth proportional to 258.95, 388.19 and 137.30 is: 205.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.95 : 388.19 = 137.30 : x
  2. Step 2: Convert to fraction form
    258.95/388.19 = 137.30/x
  3. Step 3: Cross multiply
    258.95x = 388.19 × 137.30
  4. Step 4: Simplify right side
    258.95x = 53,296.89
  5. Step 5: Solve for x
    x = 53,296.89/258.95
  6. Step 6: Final answer
    x = 205.82

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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.