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Finding the Fourth Proportional to 929.56, 1,394.01 and 271.25

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Solution

The fourth proportional to 929.56, 1,394.01 and 271.25 is: 406.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.56 : 1,394.01 = 271.25 : x
  2. Step 2: Convert to fraction form
    929.56/1,394.01 = 271.25/x
  3. Step 3: Cross multiply
    929.56x = 1,394.01 × 271.25
  4. Step 4: Simplify right side
    929.56x = 378,123.47
  5. Step 5: Solve for x
    x = 378,123.47/929.56
  6. Step 6: Final answer
    x = 406.78

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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.