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Finding the Fourth Proportional to 778.31, 1,166.09 and 693.56

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Solution

The fourth proportional to 778.31, 1,166.09 and 693.56 is: 1,039.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.31 : 1,166.09 = 693.56 : x
  2. Step 2: Convert to fraction form
    778.31/1,166.09 = 693.56/x
  3. Step 3: Cross multiply
    778.31x = 1,166.09 × 693.56
  4. Step 4: Simplify right side
    778.31x = 808,753.38
  5. Step 5: Solve for x
    x = 808,753.38/778.31
  6. Step 6: Final answer
    x = 1,039.11

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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.