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Finding the Fourth Proportional to 165.53, 248.28 and 43.78

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Solution

The fourth proportional to 165.53, 248.28 and 43.78 is: 65.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.53 : 248.28 = 43.78 : x
  2. Step 2: Convert to fraction form
    165.53/248.28 = 43.78/x
  3. Step 3: Cross multiply
    165.53x = 248.28 × 43.78
  4. Step 4: Simplify right side
    165.53x = 10,869.08
  5. Step 5: Solve for x
    x = 10,869.08/165.53
  6. Step 6: Final answer
    x = 65.66

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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.