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Finding the Fourth Proportional to 871.02, 1,305.66 and 628.68

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Solution

The fourth proportional to 871.02, 1,305.66 and 628.68 is: 942.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.02 : 1,305.66 = 628.68 : x
  2. Step 2: Convert to fraction form
    871.02/1,305.66 = 628.68/x
  3. Step 3: Cross multiply
    871.02x = 1,305.66 × 628.68
  4. Step 4: Simplify right side
    871.02x = 820,842.33
  5. Step 5: Solve for x
    x = 820,842.33/871.02
  6. Step 6: Final answer
    x = 942.39

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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.