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Finding the Fourth Proportional to 409.94, 614.92 and 121.40

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Solution

The fourth proportional to 409.94, 614.92 and 121.40 is: 182.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.94 : 614.92 = 121.40 : x
  2. Step 2: Convert to fraction form
    409.94/614.92 = 121.40/x
  3. Step 3: Cross multiply
    409.94x = 614.92 × 121.40
  4. Step 4: Simplify right side
    409.94x = 74,651.29
  5. Step 5: Solve for x
    x = 74,651.29/409.94
  6. Step 6: Final answer
    x = 182.10

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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.