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Finding the Fourth Proportional to 991.96, 1,368.98 and 549.95

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Solution

The fourth proportional to 991.96, 1,368.98 and 549.95 is: 758.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.96 : 1,368.98 = 549.95 : x
  2. Step 2: Convert to fraction form
    991.96/1,368.98 = 549.95/x
  3. Step 3: Cross multiply
    991.96x = 1,368.98 × 549.95
  4. Step 4: Simplify right side
    991.96x = 752,863.02
  5. Step 5: Solve for x
    x = 752,863.02/991.96
  6. Step 6: Final answer
    x = 758.97

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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.