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Finding the Fourth Proportional to 885.11, 1,221.31 and 512.14

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Solution

The fourth proportional to 885.11, 1,221.31 and 512.14 is: 706.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.11 : 1,221.31 = 512.14 : x
  2. Step 2: Convert to fraction form
    885.11/1,221.31 = 512.14/x
  3. Step 3: Cross multiply
    885.11x = 1,221.31 × 512.14
  4. Step 4: Simplify right side
    885.11x = 625,481.70
  5. Step 5: Solve for x
    x = 625,481.70/885.11
  6. Step 6: Final answer
    x = 706.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.