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Finding the Fourth Proportional to 394.19, 591.21 and 134.15

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Solution

The fourth proportional to 394.19, 591.21 and 134.15 is: 201.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.19 : 591.21 = 134.15 : x
  2. Step 2: Convert to fraction form
    394.19/591.21 = 134.15/x
  3. Step 3: Cross multiply
    394.19x = 591.21 × 134.15
  4. Step 4: Simplify right side
    394.19x = 79,307.87
  5. Step 5: Solve for x
    x = 79,307.87/394.19
  6. Step 6: Final answer
    x = 201.19

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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.