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Finding the Fourth Proportional to 905.71, 1,358.98 and 321.15

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Solution

The fourth proportional to 905.71, 1,358.98 and 321.15 is: 481.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.71 : 1,358.98 = 321.15 : x
  2. Step 2: Convert to fraction form
    905.71/1,358.98 = 321.15/x
  3. Step 3: Cross multiply
    905.71x = 1,358.98 × 321.15
  4. Step 4: Simplify right side
    905.71x = 436,436.43
  5. Step 5: Solve for x
    x = 436,436.43/905.71
  6. Step 6: Final answer
    x = 481.87

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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.