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Finding the Fourth Proportional to 991.39, 1,367.34 and 636.92

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Solution

The fourth proportional to 991.39, 1,367.34 and 636.92 is: 878.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.39 : 1,367.34 = 636.92 : x
  2. Step 2: Convert to fraction form
    991.39/1,367.34 = 636.92/x
  3. Step 3: Cross multiply
    991.39x = 1,367.34 × 636.92
  4. Step 4: Simplify right side
    991.39x = 870,886.19
  5. Step 5: Solve for x
    x = 870,886.19/991.39
  6. Step 6: Final answer
    x = 878.45

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1.5x scale

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.