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Finding the Fourth Proportional to 2,087.10, 3,127.92 and 990

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Solution

The fourth proportional to 2,087.10, 3,127.92 and 990 is: 1,483.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,087.10 : 3,127.92 = 990 : x
  2. Step 2: Convert to fraction form
    2,087.10/3,127.92 = 990/x
  3. Step 3: Cross multiply
    2,087.10x = 3,127.92 × 990
  4. Step 4: Simplify right side
    2,087.10x = 3,096,640.80
  5. Step 5: Solve for x
    x = 3,096,640.80/2,087.10
  6. Step 6: Final answer
    x = 1,483.71

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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.