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Finding the Fourth Proportional to 815.46, 1,221.12 and 699.36

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Solution

The fourth proportional to 815.46, 1,221.12 and 699.36 is: 1,047.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.46 : 1,221.12 = 699.36 : x
  2. Step 2: Convert to fraction form
    815.46/1,221.12 = 699.36/x
  3. Step 3: Cross multiply
    815.46x = 1,221.12 × 699.36
  4. Step 4: Simplify right side
    815.46x = 854,002.48
  5. Step 5: Solve for x
    x = 854,002.48/815.46
  6. Step 6: Final answer
    x = 1,047.26

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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.