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Finding the Fourth Proportional to 1,992.40, 2,986.16 and 1,124.90

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Solution

The fourth proportional to 1,992.40, 2,986.16 and 1,124.90 is: 1,685.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.40 : 2,986.16 = 1,124.90 : x
  2. Step 2: Convert to fraction form
    1,992.40/2,986.16 = 1,124.90/x
  3. Step 3: Cross multiply
    1,992.40x = 2,986.16 × 1,124.90
  4. Step 4: Simplify right side
    1,992.40x = 3,359,131.38
  5. Step 5: Solve for x
    x = 3,359,131.38/1,992.40
  6. Step 6: Final answer
    x = 1,685.97

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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.