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Finding the Fourth Proportional to 2,146.80, 3,219.72 and 991.44

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Solution

The fourth proportional to 2,146.80, 3,219.72 and 991.44 is: 1,486.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,146.80 : 3,219.72 = 991.44 : x
  2. Step 2: Convert to fraction form
    2,146.80/3,219.72 = 991.44/x
  3. Step 3: Cross multiply
    2,146.80x = 3,219.72 × 991.44
  4. Step 4: Simplify right side
    2,146.80x = 3,192,159.20
  5. Step 5: Solve for x
    x = 3,192,159.20/2,146.80
  6. Step 6: Final answer
    x = 1,486.94

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.