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Finding the Fourth Proportional to 1,986.92, 2,742.10 and 1,102.90

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Solution

The fourth proportional to 1,986.92, 2,742.10 and 1,102.90 is: 1,522.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.92 : 2,742.10 = 1,102.90 : x
  2. Step 2: Convert to fraction form
    1,986.92/2,742.10 = 1,102.90/x
  3. Step 3: Cross multiply
    1,986.92x = 2,742.10 × 1,102.90
  4. Step 4: Simplify right side
    1,986.92x = 3,024,262.09
  5. Step 5: Solve for x
    x = 3,024,262.09/1,986.92
  6. Step 6: Final answer
    x = 1,522.09

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1.5x scale

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.