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Finding the Fourth Proportional to 2,086.28, 3,129.42 and 788.12

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Solution

The fourth proportional to 2,086.28, 3,129.42 and 788.12 is: 1,182.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.28 : 3,129.42 = 788.12 : x
  2. Step 2: Convert to fraction form
    2,086.28/3,129.42 = 788.12/x
  3. Step 3: Cross multiply
    2,086.28x = 3,129.42 × 788.12
  4. Step 4: Simplify right side
    2,086.28x = 2,466,358.49
  5. Step 5: Solve for x
    x = 2,466,358.49/2,086.28
  6. Step 6: Final answer
    x = 1,182.18

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1.5x scale

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.