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Finding the Fourth Proportional to 386.87, 581.11 and 204.21

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Solution

The fourth proportional to 386.87, 581.11 and 204.21 is: 306.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.87 : 581.11 = 204.21 : x
  2. Step 2: Convert to fraction form
    386.87/581.11 = 204.21/x
  3. Step 3: Cross multiply
    386.87x = 581.11 × 204.21
  4. Step 4: Simplify right side
    386.87x = 118,667.96
  5. Step 5: Solve for x
    x = 118,667.96/386.87
  6. Step 6: Final answer
    x = 306.74

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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.