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Finding the Fourth Proportional to 869.86, 1,199.62 and 575.42

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Solution

The fourth proportional to 869.86, 1,199.62 and 575.42 is: 793.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.86 : 1,199.62 = 575.42 : x
  2. Step 2: Convert to fraction form
    869.86/1,199.62 = 575.42/x
  3. Step 3: Cross multiply
    869.86x = 1,199.62 × 575.42
  4. Step 4: Simplify right side
    869.86x = 690,285.34
  5. Step 5: Solve for x
    x = 690,285.34/869.86
  6. Step 6: Final answer
    x = 793.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.