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Finding the Fourth Proportional to 708.86, 1,063.18 and 221.78

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Solution

The fourth proportional to 708.86, 1,063.18 and 221.78 is: 332.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.86 : 1,063.18 = 221.78 : x
  2. Step 2: Convert to fraction form
    708.86/1,063.18 = 221.78/x
  3. Step 3: Cross multiply
    708.86x = 1,063.18 × 221.78
  4. Step 4: Simplify right side
    708.86x = 235,790.95
  5. Step 5: Solve for x
    x = 235,790.95/708.86
  6. Step 6: Final answer
    x = 332.63

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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.