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Finding the Fourth Proportional to 1,139.10, 1,707.30 and 850.20

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Solution

The fourth proportional to 1,139.10, 1,707.30 and 850.20 is: 1,274.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.10 : 1,707.30 = 850.20 : x
  2. Step 2: Convert to fraction form
    1,139.10/1,707.30 = 850.20/x
  3. Step 3: Cross multiply
    1,139.10x = 1,707.30 × 850.20
  4. Step 4: Simplify right side
    1,139.10x = 1,451,546.46
  5. Step 5: Solve for x
    x = 1,451,546.46/1,139.10
  6. Step 6: Final answer
    x = 1,274.29

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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.