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Finding the Fourth Proportional to 288.29, 397.78 and 170.21

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Solution

The fourth proportional to 288.29, 397.78 and 170.21 is: 234.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.29 : 397.78 = 170.21 : x
  2. Step 2: Convert to fraction form
    288.29/397.78 = 170.21/x
  3. Step 3: Cross multiply
    288.29x = 397.78 × 170.21
  4. Step 4: Simplify right side
    288.29x = 67,706.70
  5. Step 5: Solve for x
    x = 67,706.70/288.29
  6. Step 6: Final answer
    x = 234.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.