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Finding the Fourth Proportional to 708.69, 1,063.11 and 221.61

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Solution

The fourth proportional to 708.69, 1,063.11 and 221.61 is: 332.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.69 : 1,063.11 = 221.61 : x
  2. Step 2: Convert to fraction form
    708.69/1,063.11 = 221.61/x
  3. Step 3: Cross multiply
    708.69x = 1,063.11 × 221.61
  4. Step 4: Simplify right side
    708.69x = 235,595.81
  5. Step 5: Solve for x
    x = 235,595.81/708.69
  6. Step 6: Final answer
    x = 332.44

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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.