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Finding the Fourth Proportional to 411.18, 618.84 and 309

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Solution

The fourth proportional to 411.18, 618.84 and 309 is: 465.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.18 : 618.84 = 309 : x
  2. Step 2: Convert to fraction form
    411.18/618.84 = 309/x
  3. Step 3: Cross multiply
    411.18x = 618.84 × 309
  4. Step 4: Simplify right side
    411.18x = 191,221.56
  5. Step 5: Solve for x
    x = 191,221.56/411.18
  6. Step 6: Final answer
    x = 465.06

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.