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Finding the Fourth Proportional to 242.45, 362.89 and 221.19

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Solution

The fourth proportional to 242.45, 362.89 and 221.19 is: 331.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.45 : 362.89 = 221.19 : x
  2. Step 2: Convert to fraction form
    242.45/362.89 = 221.19/x
  3. Step 3: Cross multiply
    242.45x = 362.89 × 221.19
  4. Step 4: Simplify right side
    242.45x = 80,267.64
  5. Step 5: Solve for x
    x = 80,267.64/242.45
  6. Step 6: Final answer
    x = 331.07

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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.