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Finding the Fourth Proportional to 248.78, 343.32 and 145.28

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Solution

The fourth proportional to 248.78, 343.32 and 145.28 is: 200.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.78 : 343.32 = 145.28 : x
  2. Step 2: Convert to fraction form
    248.78/343.32 = 145.28/x
  3. Step 3: Cross multiply
    248.78x = 343.32 × 145.28
  4. Step 4: Simplify right side
    248.78x = 49,877.53
  5. Step 5: Solve for x
    x = 49,877.53/248.78
  6. Step 6: Final answer
    x = 200.49

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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.