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Finding the Fourth Proportional to 838.84, 1,256.42 and 427.26

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Solution

The fourth proportional to 838.84, 1,256.42 and 427.26 is: 639.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.84 : 1,256.42 = 427.26 : x
  2. Step 2: Convert to fraction form
    838.84/1,256.42 = 427.26/x
  3. Step 3: Cross multiply
    838.84x = 1,256.42 × 427.26
  4. Step 4: Simplify right side
    838.84x = 536,818.01
  5. Step 5: Solve for x
    x = 536,818.01/838.84
  6. Step 6: Final answer
    x = 639.95

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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.