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Finding the Fourth Proportional to 248.25, 342.59 and 137.72

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Solution

The fourth proportional to 248.25, 342.59 and 137.72 is: 190.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.25 : 342.59 = 137.72 : x
  2. Step 2: Convert to fraction form
    248.25/342.59 = 137.72/x
  3. Step 3: Cross multiply
    248.25x = 342.59 × 137.72
  4. Step 4: Simplify right side
    248.25x = 47,181.66
  5. Step 5: Solve for x
    x = 47,181.66/248.25
  6. Step 6: Final answer
    x = 190.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.