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Finding the Fourth Proportional to 708.15, 1,062.23 and 221.20

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Solution

The fourth proportional to 708.15, 1,062.23 and 221.20 is: 331.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.15 : 1,062.23 = 221.20 : x
  2. Step 2: Convert to fraction form
    708.15/1,062.23 = 221.20/x
  3. Step 3: Cross multiply
    708.15x = 1,062.23 × 221.20
  4. Step 4: Simplify right side
    708.15x = 234,965.50
  5. Step 5: Solve for x
    x = 234,965.50/708.15
  6. Step 6: Final answer
    x = 331.80

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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.