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Finding the Fourth Proportional to 838.19, 1,257.29 and 221.90

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Solution

The fourth proportional to 838.19, 1,257.29 and 221.90 is: 332.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.19 : 1,257.29 = 221.90 : x
  2. Step 2: Convert to fraction form
    838.19/1,257.29 = 221.90/x
  3. Step 3: Cross multiply
    838.19x = 1,257.29 × 221.90
  4. Step 4: Simplify right side
    838.19x = 278,986.92
  5. Step 5: Solve for x
    x = 278,986.92/838.19
  6. Step 6: Final answer
    x = 332.84

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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.