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Finding the Fourth Proportional to 781.11, 1,169.64 and 575.37

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Solution

The fourth proportional to 781.11, 1,169.64 and 575.37 is: 861.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.11 : 1,169.64 = 575.37 : x
  2. Step 2: Convert to fraction form
    781.11/1,169.64 = 575.37/x
  3. Step 3: Cross multiply
    781.11x = 1,169.64 × 575.37
  4. Step 4: Simplify right side
    781.11x = 672,975.77
  5. Step 5: Solve for x
    x = 672,975.77/781.11
  6. Step 6: Final answer
    x = 861.56

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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.