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Finding the Fourth Proportional to 871.19, 1,305.70 and 636.56

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Solution

The fourth proportional to 871.19, 1,305.70 and 636.56 is: 954.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.19 : 1,305.70 = 636.56 : x
  2. Step 2: Convert to fraction form
    871.19/1,305.70 = 636.56/x
  3. Step 3: Cross multiply
    871.19x = 1,305.70 × 636.56
  4. Step 4: Simplify right side
    871.19x = 831,146.68
  5. Step 5: Solve for x
    x = 831,146.68/871.19
  6. Step 6: Final answer
    x = 954.04

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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.