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Finding the Fourth Proportional to 990.86, 1,367.81 and 632.09

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Solution

The fourth proportional to 990.86, 1,367.81 and 632.09 is: 872.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.86 : 1,367.81 = 632.09 : x
  2. Step 2: Convert to fraction form
    990.86/1,367.81 = 632.09/x
  3. Step 3: Cross multiply
    990.86x = 1,367.81 × 632.09
  4. Step 4: Simplify right side
    990.86x = 864,584.02
  5. Step 5: Solve for x
    x = 864,584.02/990.86
  6. Step 6: Final answer
    x = 872.56

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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.