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Finding the Fourth Proportional to 793.38, 1,189.77 and 318.32

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Solution

The fourth proportional to 793.38, 1,189.77 and 318.32 is: 477.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.38 : 1,189.77 = 318.32 : x
  2. Step 2: Convert to fraction form
    793.38/1,189.77 = 318.32/x
  3. Step 3: Cross multiply
    793.38x = 1,189.77 × 318.32
  4. Step 4: Simplify right side
    793.38x = 378,721.64
  5. Step 5: Solve for x
    x = 378,721.64/793.38
  6. Step 6: Final answer
    x = 477.35

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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.