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Finding the Fourth Proportional to 838.67, 1,256.97 and 427.58

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Solution

The fourth proportional to 838.67, 1,256.97 and 427.58 is: 640.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.67 : 1,256.97 = 427.58 : x
  2. Step 2: Convert to fraction form
    838.67/1,256.97 = 427.58/x
  3. Step 3: Cross multiply
    838.67x = 1,256.97 × 427.58
  4. Step 4: Simplify right side
    838.67x = 537,455.23
  5. Step 5: Solve for x
    x = 537,455.23/838.67
  6. Step 6: Final answer
    x = 640.84

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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.