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Finding the Fourth Proportional to 990.39, 1,365.96 and 635.92

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Solution

The fourth proportional to 990.39, 1,365.96 and 635.92 is: 877.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.39 : 1,365.96 = 635.92 : x
  2. Step 2: Convert to fraction form
    990.39/1,365.96 = 635.92/x
  3. Step 3: Cross multiply
    990.39x = 1,365.96 × 635.92
  4. Step 4: Simplify right side
    990.39x = 868,641.28
  5. Step 5: Solve for x
    x = 868,641.28/990.39
  6. Step 6: Final answer
    x = 877.07

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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.