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Finding the Fourth Proportional to 394.68, 591.30 and 309

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Solution

The fourth proportional to 394.68, 591.30 and 309 is: 462.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.68 : 591.30 = 309 : x
  2. Step 2: Convert to fraction form
    394.68/591.30 = 309/x
  3. Step 3: Cross multiply
    394.68x = 591.30 × 309
  4. Step 4: Simplify right side
    394.68x = 182,711.70
  5. Step 5: Solve for x
    x = 182,711.70/394.68
  6. Step 6: Final answer
    x = 462.94

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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.