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Finding the Fourth Proportional to 908.86, 1,365.56 and 579.94

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Solution

The fourth proportional to 908.86, 1,365.56 and 579.94 is: 871.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.86 : 1,365.56 = 579.94 : x
  2. Step 2: Convert to fraction form
    908.86/1,365.56 = 579.94/x
  3. Step 3: Cross multiply
    908.86x = 1,365.56 × 579.94
  4. Step 4: Simplify right side
    908.86x = 791,942.87
  5. Step 5: Solve for x
    x = 791,942.87/908.86
  6. Step 6: Final answer
    x = 871.36

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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.