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Finding the Fourth Proportional to 379.92, 570.05 and 206.72

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Solution

The fourth proportional to 379.92, 570.05 and 206.72 is: 310.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.92 : 570.05 = 206.72 : x
  2. Step 2: Convert to fraction form
    379.92/570.05 = 206.72/x
  3. Step 3: Cross multiply
    379.92x = 570.05 × 206.72
  4. Step 4: Simplify right side
    379.92x = 117,840.93
  5. Step 5: Solve for x
    x = 117,840.93/379.92
  6. Step 6: Final answer
    x = 310.17

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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.