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Finding the Fourth Proportional to 837.94, 1,257.18 and 427.18

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Solution

The fourth proportional to 837.94, 1,257.18 and 427.18 is: 640.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.94 : 1,257.18 = 427.18 : x
  2. Step 2: Convert to fraction form
    837.94/1,257.18 = 427.18/x
  3. Step 3: Cross multiply
    837.94x = 1,257.18 × 427.18
  4. Step 4: Simplify right side
    837.94x = 537,042.15
  5. Step 5: Solve for x
    x = 537,042.15/837.94
  6. Step 6: Final answer
    x = 640.91

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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.