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Finding the Fourth Proportional to 1,072.22, 1,605.20 and 660.12

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Solution

The fourth proportional to 1,072.22, 1,605.20 and 660.12 is: 988.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.22 : 1,605.20 = 660.12 : x
  2. Step 2: Convert to fraction form
    1,072.22/1,605.20 = 660.12/x
  3. Step 3: Cross multiply
    1,072.22x = 1,605.20 × 660.12
  4. Step 4: Simplify right side
    1,072.22x = 1,059,624.62
  5. Step 5: Solve for x
    x = 1,059,624.62/1,072.22
  6. Step 6: Final answer
    x = 988.25

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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.