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Finding the Fourth Proportional to 411.31, 616.90 and 154.75

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Solution

The fourth proportional to 411.31, 616.90 and 154.75 is: 232.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.31 : 616.90 = 154.75 : x
  2. Step 2: Convert to fraction form
    411.31/616.90 = 154.75/x
  3. Step 3: Cross multiply
    411.31x = 616.90 × 154.75
  4. Step 4: Simplify right side
    411.31x = 95,465.28
  5. Step 5: Solve for x
    x = 95,465.28/411.31
  6. Step 6: Final answer
    x = 232.10

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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.