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Finding the Fourth Proportional to 258.94, 388.76 and 137.30

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Solution

The fourth proportional to 258.94, 388.76 and 137.30 is: 206.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.94 : 388.76 = 137.30 : x
  2. Step 2: Convert to fraction form
    258.94/388.76 = 137.30/x
  3. Step 3: Cross multiply
    258.94x = 388.76 × 137.30
  4. Step 4: Simplify right side
    258.94x = 53,376.75
  5. Step 5: Solve for x
    x = 53,376.75/258.94
  6. Step 6: Final answer
    x = 206.14

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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.