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Finding the Fourth Proportional to 838.10, 1,255.35 and 694.10

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Solution

The fourth proportional to 838.10, 1,255.35 and 694.10 is: 1,039.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.10 : 1,255.35 = 694.10 : x
  2. Step 2: Convert to fraction form
    838.10/1,255.35 = 694.10/x
  3. Step 3: Cross multiply
    838.10x = 1,255.35 × 694.10
  4. Step 4: Simplify right side
    838.10x = 871,338.44
  5. Step 5: Solve for x
    x = 871,338.44/838.10
  6. Step 6: Final answer
    x = 1,039.66

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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.