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Finding the Fourth Proportional to 1,272.15, 1,908.22 and 839.20

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Solution

The fourth proportional to 1,272.15, 1,908.22 and 839.20 is: 1,258.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.15 : 1,908.22 = 839.20 : x
  2. Step 2: Convert to fraction form
    1,272.15/1,908.22 = 839.20/x
  3. Step 3: Cross multiply
    1,272.15x = 1,908.22 × 839.20
  4. Step 4: Simplify right side
    1,272.15x = 1,601,378.22
  5. Step 5: Solve for x
    x = 1,601,378.22/1,272.15
  6. Step 6: Final answer
    x = 1,258.80

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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.