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Finding the Fourth Proportional to 820.36, 1,228.92 and 656.11

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Solution

The fourth proportional to 820.36, 1,228.92 and 656.11 is: 982.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.36 : 1,228.92 = 656.11 : x
  2. Step 2: Convert to fraction form
    820.36/1,228.92 = 656.11/x
  3. Step 3: Cross multiply
    820.36x = 1,228.92 × 656.11
  4. Step 4: Simplify right side
    820.36x = 806,306.70
  5. Step 5: Solve for x
    x = 806,306.70/820.36
  6. Step 6: Final answer
    x = 982.87

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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.