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Finding the Fourth Proportional to 242.78, 364.17 and 121.00

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Solution

The fourth proportional to 242.78, 364.17 and 121.00 is: 181.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.78 : 364.17 = 121.00 : x
  2. Step 2: Convert to fraction form
    242.78/364.17 = 121.00/x
  3. Step 3: Cross multiply
    242.78x = 364.17 × 121.00
  4. Step 4: Simplify right side
    242.78x = 44,062.75
  5. Step 5: Solve for x
    x = 44,062.75/242.78
  6. Step 6: Final answer
    x = 181.49

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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.