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Finding the Fourth Proportional to 991.21, 1,367.84 and 549.11

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Solution

The fourth proportional to 991.21, 1,367.84 and 549.11 is: 757.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.21 : 1,367.84 = 549.11 : x
  2. Step 2: Convert to fraction form
    991.21/1,367.84 = 549.11/x
  3. Step 3: Cross multiply
    991.21x = 1,367.84 × 549.11
  4. Step 4: Simplify right side
    991.21x = 751,087.78
  5. Step 5: Solve for x
    x = 751,087.78/991.21
  6. Step 6: Final answer
    x = 757.75

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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.