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Finding the Fourth Proportional to 1,107.40, 1,661.10 and 991.98

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Solution

The fourth proportional to 1,107.40, 1,661.10 and 991.98 is: 1,487.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.40 : 1,661.10 = 991.98 : x
  2. Step 2: Convert to fraction form
    1,107.40/1,661.10 = 991.98/x
  3. Step 3: Cross multiply
    1,107.40x = 1,661.10 × 991.98
  4. Step 4: Simplify right side
    1,107.40x = 1,647,777.98
  5. Step 5: Solve for x
    x = 1,647,777.98/1,107.40
  6. Step 6: Final answer
    x = 1,487.97

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Why These Related Problems?

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