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Finding the Fourth Proportional to 991.11, 1,367.79 and 549.06

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Solution

The fourth proportional to 991.11, 1,367.79 and 549.06 is: 757.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.11 : 1,367.79 = 549.06 : x
  2. Step 2: Convert to fraction form
    991.11/1,367.79 = 549.06/x
  3. Step 3: Cross multiply
    991.11x = 1,367.79 × 549.06
  4. Step 4: Simplify right side
    991.11x = 750,998.78
  5. Step 5: Solve for x
    x = 750,998.78/991.11
  6. Step 6: Final answer
    x = 757.74

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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.