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Finding the Fourth Proportional to 411.12, 616.32 and 194.58

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Solution

The fourth proportional to 411.12, 616.32 and 194.58 is: 291.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.12 : 616.32 = 194.58 : x
  2. Step 2: Convert to fraction form
    411.12/616.32 = 194.58/x
  3. Step 3: Cross multiply
    411.12x = 616.32 × 194.58
  4. Step 4: Simplify right side
    411.12x = 119,923.55
  5. Step 5: Solve for x
    x = 119,923.55/411.12
  6. Step 6: Final answer
    x = 291.70

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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.