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Finding the Fourth Proportional to 411.25, 616.07 and 342.55

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Solution

The fourth proportional to 411.25, 616.07 and 342.55 is: 513.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.25 : 616.07 = 342.55 : x
  2. Step 2: Convert to fraction form
    411.25/616.07 = 342.55/x
  3. Step 3: Cross multiply
    411.25x = 616.07 × 342.55
  4. Step 4: Simplify right side
    411.25x = 211,034.78
  5. Step 5: Solve for x
    x = 211,034.78/411.25
  6. Step 6: Final answer
    x = 513.15

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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.