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Finding the Fourth Proportional to 998.91, 1,379.37 and 626.53

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Solution

The fourth proportional to 998.91, 1,379.37 and 626.53 is: 865.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.91 : 1,379.37 = 626.53 : x
  2. Step 2: Convert to fraction form
    998.91/1,379.37 = 626.53/x
  3. Step 3: Cross multiply
    998.91x = 1,379.37 × 626.53
  4. Step 4: Simplify right side
    998.91x = 864,213.55
  5. Step 5: Solve for x
    x = 864,213.55/998.91
  6. Step 6: Final answer
    x = 865.16

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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.