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Finding the Fourth Proportional to 411.65, 617.42 and 115.18

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Solution

The fourth proportional to 411.65, 617.42 and 115.18 is: 172.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.65 : 617.42 = 115.18 : x
  2. Step 2: Convert to fraction form
    411.65/617.42 = 115.18/x
  3. Step 3: Cross multiply
    411.65x = 617.42 × 115.18
  4. Step 4: Simplify right side
    411.65x = 71,114.92
  5. Step 5: Solve for x
    x = 71,114.92/411.65
  6. Step 6: Final answer
    x = 172.76

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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.