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Finding the Fourth Proportional to 991.94, 1,368.84 and 549.83

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Solution

The fourth proportional to 991.94, 1,368.84 and 549.83 is: 758.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.94 : 1,368.84 = 549.83 : x
  2. Step 2: Convert to fraction form
    991.94/1,368.84 = 549.83/x
  3. Step 3: Cross multiply
    991.94x = 1,368.84 × 549.83
  4. Step 4: Simplify right side
    991.94x = 752,629.30
  5. Step 5: Solve for x
    x = 752,629.30/991.94
  6. Step 6: Final answer
    x = 758.74

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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.