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Finding the Fourth Proportional to 165.38, 248.25 and 121.91

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Solution

The fourth proportional to 165.38, 248.25 and 121.91 is: 183.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.38 : 248.25 = 121.91 : x
  2. Step 2: Convert to fraction form
    165.38/248.25 = 121.91/x
  3. Step 3: Cross multiply
    165.38x = 248.25 × 121.91
  4. Step 4: Simplify right side
    165.38x = 30,264.16
  5. Step 5: Solve for x
    x = 30,264.16/165.38
  6. Step 6: Final answer
    x = 183.00

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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.