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Finding the Fourth Proportional to 701.24, 966.86 and 638.81

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Solution

The fourth proportional to 701.24, 966.86 and 638.81 is: 880.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    701.24 : 966.86 = 638.81 : x
  2. Step 2: Convert to fraction form
    701.24/966.86 = 638.81/x
  3. Step 3: Cross multiply
    701.24x = 966.86 × 638.81
  4. Step 4: Simplify right side
    701.24x = 617,636.64
  5. Step 5: Solve for x
    x = 617,636.64/701.24
  6. Step 6: Final answer
    x = 880.78

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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.