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Finding the Fourth Proportional to 871.22, 1,305.39 and 545.78

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Solution

The fourth proportional to 871.22, 1,305.39 and 545.78 is: 817.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.22 : 1,305.39 = 545.78 : x
  2. Step 2: Convert to fraction form
    871.22/1,305.39 = 545.78/x
  3. Step 3: Cross multiply
    871.22x = 1,305.39 × 545.78
  4. Step 4: Simplify right side
    871.22x = 712,455.75
  5. Step 5: Solve for x
    x = 712,455.75/871.22
  6. Step 6: Final answer
    x = 817.77

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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.