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Finding the Fourth Proportional to 248.61, 345.02 and 238.71

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Solution

The fourth proportional to 248.61, 345.02 and 238.71 is: 331.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.61 : 345.02 = 238.71 : x
  2. Step 2: Convert to fraction form
    248.61/345.02 = 238.71/x
  3. Step 3: Cross multiply
    248.61x = 345.02 × 238.71
  4. Step 4: Simplify right side
    248.61x = 82,360.32
  5. Step 5: Solve for x
    x = 82,360.32/248.61
  6. Step 6: Final answer
    x = 331.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.