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Finding the Fourth Proportional to 409.92, 614.79 and 121.29

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Solution

The fourth proportional to 409.92, 614.79 and 121.29 is: 181.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.92 : 614.79 = 121.29 : x
  2. Step 2: Convert to fraction form
    409.92/614.79 = 121.29/x
  3. Step 3: Cross multiply
    409.92x = 614.79 × 121.29
  4. Step 4: Simplify right side
    409.92x = 74,567.88
  5. Step 5: Solve for x
    x = 74,567.88/409.92
  6. Step 6: Final answer
    x = 181.91

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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.