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Finding the Fourth Proportional to 793.56, 1,191.78 and 691.56

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Solution

The fourth proportional to 793.56, 1,191.78 and 691.56 is: 1,038.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.56 : 1,191.78 = 691.56 : x
  2. Step 2: Convert to fraction form
    793.56/1,191.78 = 691.56/x
  3. Step 3: Cross multiply
    793.56x = 1,191.78 × 691.56
  4. Step 4: Simplify right side
    793.56x = 824,187.38
  5. Step 5: Solve for x
    x = 824,187.38/793.56
  6. Step 6: Final answer
    x = 1,038.59

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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.