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Finding the Fourth Proportional to 248.32, 342.68 and 137.79

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Solution

The fourth proportional to 248.32, 342.68 and 137.79 is: 190.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.32 : 342.68 = 137.79 : x
  2. Step 2: Convert to fraction form
    248.32/342.68 = 137.79/x
  3. Step 3: Cross multiply
    248.32x = 342.68 × 137.79
  4. Step 4: Simplify right side
    248.32x = 47,217.88
  5. Step 5: Solve for x
    x = 47,217.88/248.32
  6. Step 6: Final answer
    x = 190.15

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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.