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Finding the Fourth Proportional to 1,378.92, 2,066.22 and 794.28

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Solution

The fourth proportional to 1,378.92, 2,066.22 and 794.28 is: 1,190.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.92 : 2,066.22 = 794.28 : x
  2. Step 2: Convert to fraction form
    1,378.92/2,066.22 = 794.28/x
  3. Step 3: Cross multiply
    1,378.92x = 2,066.22 × 794.28
  4. Step 4: Simplify right side
    1,378.92x = 1,641,157.22
  5. Step 5: Solve for x
    x = 1,641,157.22/1,378.92
  6. Step 6: Final answer
    x = 1,190.18

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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.