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Finding the Fourth Proportional to 411.96, 617.91 and 103.80

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Solution

The fourth proportional to 411.96, 617.91 and 103.80 is: 155.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.96 : 617.91 = 103.80 : x
  2. Step 2: Convert to fraction form
    411.96/617.91 = 103.80/x
  3. Step 3: Cross multiply
    411.96x = 617.91 × 103.80
  4. Step 4: Simplify right side
    411.96x = 64,139.06
  5. Step 5: Solve for x
    x = 64,139.06/411.96
  6. Step 6: Final answer
    x = 155.69

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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.