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Finding the Fourth Proportional to 634.64, 879.38 and 626.72

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Solution

The fourth proportional to 634.64, 879.38 and 626.72 is: 868.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.64 : 879.38 = 626.72 : x
  2. Step 2: Convert to fraction form
    634.64/879.38 = 626.72/x
  3. Step 3: Cross multiply
    634.64x = 879.38 × 626.72
  4. Step 4: Simplify right side
    634.64x = 551,125.03
  5. Step 5: Solve for x
    x = 551,125.03/634.64
  6. Step 6: Final answer
    x = 868.41

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.