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Finding the Fourth Proportional to 838.05, 1,255.12 and 426.18

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Solution

The fourth proportional to 838.05, 1,255.12 and 426.18 is: 638.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.05 : 1,255.12 = 426.18 : x
  2. Step 2: Convert to fraction form
    838.05/1,255.12 = 426.18/x
  3. Step 3: Cross multiply
    838.05x = 1,255.12 × 426.18
  4. Step 4: Simplify right side
    838.05x = 534,907.04
  5. Step 5: Solve for x
    x = 534,907.04/838.05
  6. Step 6: Final answer
    x = 638.28

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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.