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Finding the Fourth Proportional to 411.40, 616.40 and 324.40

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Solution

The fourth proportional to 411.40, 616.40 and 324.40 is: 486.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.40 : 616.40 = 324.40 : x
  2. Step 2: Convert to fraction form
    411.40/616.40 = 324.40/x
  3. Step 3: Cross multiply
    411.40x = 616.40 × 324.40
  4. Step 4: Simplify right side
    411.40x = 199,960.16
  5. Step 5: Solve for x
    x = 199,960.16/411.40
  6. Step 6: Final answer
    x = 486.05

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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.