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Finding the Fourth Proportional to 411.82, 616.68 and 309.76

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Solution

The fourth proportional to 411.82, 616.68 and 309.76 is: 463.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.82 : 616.68 = 309.76 : x
  2. Step 2: Convert to fraction form
    411.82/616.68 = 309.76/x
  3. Step 3: Cross multiply
    411.82x = 616.68 × 309.76
  4. Step 4: Simplify right side
    411.82x = 191,021.26
  5. Step 5: Solve for x
    x = 191,021.26/411.82
  6. Step 6: Final answer
    x = 463.85

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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.