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Finding the Fourth Proportional to 242.68, 365.54 and 221.15

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Solution

The fourth proportional to 242.68, 365.54 and 221.15 is: 333.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.68 : 365.54 = 221.15 : x
  2. Step 2: Convert to fraction form
    242.68/365.54 = 221.15/x
  3. Step 3: Cross multiply
    242.68x = 365.54 × 221.15
  4. Step 4: Simplify right side
    242.68x = 80,837.34
  5. Step 5: Solve for x
    x = 80,837.34/242.68
  6. Step 6: Final answer
    x = 333.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.