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Finding the Fourth Proportional to 185.52, 278.16 and 121.28

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Solution

The fourth proportional to 185.52, 278.16 and 121.28 is: 181.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.52 : 278.16 = 121.28 : x
  2. Step 2: Convert to fraction form
    185.52/278.16 = 121.28/x
  3. Step 3: Cross multiply
    185.52x = 278.16 × 121.28
  4. Step 4: Simplify right side
    185.52x = 33,735.24
  5. Step 5: Solve for x
    x = 33,735.24/185.52
  6. Step 6: Final answer
    x = 181.84

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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.