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Finding the Fourth Proportional to 259.14, 388.86 and 137.48

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Solution

The fourth proportional to 259.14, 388.86 and 137.48 is: 206.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.14 : 388.86 = 137.48 : x
  2. Step 2: Convert to fraction form
    259.14/388.86 = 137.48/x
  3. Step 3: Cross multiply
    259.14x = 388.86 × 137.48
  4. Step 4: Simplify right side
    259.14x = 53,460.47
  5. Step 5: Solve for x
    x = 53,460.47/259.14
  6. Step 6: Final answer
    x = 206.30

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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.