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Finding the Fourth Proportional to 411.47, 617.20 and 122.91

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Solution

The fourth proportional to 411.47, 617.20 and 122.91 is: 184.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.47 : 617.20 = 122.91 : x
  2. Step 2: Convert to fraction form
    411.47/617.20 = 122.91/x
  3. Step 3: Cross multiply
    411.47x = 617.20 × 122.91
  4. Step 4: Simplify right side
    411.47x = 75,858.12
  5. Step 5: Solve for x
    x = 75,858.12/411.47
  6. Step 6: Final answer
    x = 184.36

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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.