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Finding the Fourth Proportional to 409.68, 614.46 and 121.20

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Solution

The fourth proportional to 409.68, 614.46 and 121.20 is: 181.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.68 : 614.46 = 121.20 : x
  2. Step 2: Convert to fraction form
    409.68/614.46 = 121.20/x
  3. Step 3: Cross multiply
    409.68x = 614.46 × 121.20
  4. Step 4: Simplify right side
    409.68x = 74,472.55
  5. Step 5: Solve for x
    x = 74,472.55/409.68
  6. Step 6: Final answer
    x = 181.78

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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.