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Finding the Fourth Proportional to 411.84, 617.87 and 123.28

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Solution

The fourth proportional to 411.84, 617.87 and 123.28 is: 184.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.84 : 617.87 = 123.28 : x
  2. Step 2: Convert to fraction form
    411.84/617.87 = 123.28/x
  3. Step 3: Cross multiply
    411.84x = 617.87 × 123.28
  4. Step 4: Simplify right side
    411.84x = 76,171.63
  5. Step 5: Solve for x
    x = 76,171.63/411.84
  6. Step 6: Final answer
    x = 184.95

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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.