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Finding the Fourth Proportional to 991.20, 1,367.90 and 549.09

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Solution

The fourth proportional to 991.20, 1,367.90 and 549.09 is: 757.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.20 : 1,367.90 = 549.09 : x
  2. Step 2: Convert to fraction form
    991.20/1,367.90 = 549.09/x
  3. Step 3: Cross multiply
    991.20x = 1,367.90 × 549.09
  4. Step 4: Simplify right side
    991.20x = 751,097.47
  5. Step 5: Solve for x
    x = 751,097.47/991.20
  6. Step 6: Final answer
    x = 757.77

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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.