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Finding the Fourth Proportional to 906.38, 1,359.75 and 321.39

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Solution

The fourth proportional to 906.38, 1,359.75 and 321.39 is: 482.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.38 : 1,359.75 = 321.39 : x
  2. Step 2: Convert to fraction form
    906.38/1,359.75 = 321.39/x
  3. Step 3: Cross multiply
    906.38x = 1,359.75 × 321.39
  4. Step 4: Simplify right side
    906.38x = 437,010.05
  5. Step 5: Solve for x
    x = 437,010.05/906.38
  6. Step 6: Final answer
    x = 482.15

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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.