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Finding the Fourth Proportional to 411.66, 621.14 and 408.42

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Solution

The fourth proportional to 411.66, 621.14 and 408.42 is: 616.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.66 : 621.14 = 408.42 : x
  2. Step 2: Convert to fraction form
    411.66/621.14 = 408.42/x
  3. Step 3: Cross multiply
    411.66x = 621.14 × 408.42
  4. Step 4: Simplify right side
    411.66x = 253,683.96
  5. Step 5: Solve for x
    x = 253,683.96/411.66
  6. Step 6: Final answer
    x = 616.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.