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Finding the Fourth Proportional to 258.74, 388.59 and 137.10

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Solution

The fourth proportional to 258.74, 388.59 and 137.10 is: 205.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.74 : 388.59 = 137.10 : x
  2. Step 2: Convert to fraction form
    258.74/388.59 = 137.10/x
  3. Step 3: Cross multiply
    258.74x = 388.59 × 137.10
  4. Step 4: Simplify right side
    258.74x = 53,275.69
  5. Step 5: Solve for x
    x = 53,275.69/258.74
  6. Step 6: Final answer
    x = 205.90

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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.