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Finding the Fourth Proportional to 850.18, 1,172.42 and 638.77

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Solution

The fourth proportional to 850.18, 1,172.42 and 638.77 is: 880.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.18 : 1,172.42 = 638.77 : x
  2. Step 2: Convert to fraction form
    850.18/1,172.42 = 638.77/x
  3. Step 3: Cross multiply
    850.18x = 1,172.42 × 638.77
  4. Step 4: Simplify right side
    850.18x = 748,906.72
  5. Step 5: Solve for x
    x = 748,906.72/850.18
  6. Step 6: Final answer
    x = 880.88

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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.