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Finding the Fourth Proportional to 238.43, 328.57 and 221.70

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Solution

The fourth proportional to 238.43, 328.57 and 221.70 is: 305.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.43 : 328.57 = 221.70 : x
  2. Step 2: Convert to fraction form
    238.43/328.57 = 221.70/x
  3. Step 3: Cross multiply
    238.43x = 328.57 × 221.70
  4. Step 4: Simplify right side
    238.43x = 72,843.97
  5. Step 5: Solve for x
    x = 72,843.97/238.43
  6. Step 6: Final answer
    x = 305.52

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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.