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Finding the Fourth Proportional to 838.95, 1,257.05 and 427.52

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Solution

The fourth proportional to 838.95, 1,257.05 and 427.52 is: 640.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.95 : 1,257.05 = 427.52 : x
  2. Step 2: Convert to fraction form
    838.95/1,257.05 = 427.52/x
  3. Step 3: Cross multiply
    838.95x = 1,257.05 × 427.52
  4. Step 4: Simplify right side
    838.95x = 537,414.02
  5. Step 5: Solve for x
    x = 537,414.02/838.95
  6. Step 6: Final answer
    x = 640.58

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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.