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Finding the Fourth Proportional to 991.28, 1,368 and 549.16

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Solution

The fourth proportional to 991.28, 1,368 and 549.16 is: 757.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.28 : 1,368 = 549.16 : x
  2. Step 2: Convert to fraction form
    991.28/1,368 = 549.16/x
  3. Step 3: Cross multiply
    991.28x = 1,368 × 549.16
  4. Step 4: Simplify right side
    991.28x = 751,250.88
  5. Step 5: Solve for x
    x = 751,250.88/991.28
  6. Step 6: Final answer
    x = 757.86

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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.