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Finding the Fourth Proportional to 905.96, 1,358.90 and 320.95

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Solution

The fourth proportional to 905.96, 1,358.90 and 320.95 is: 481.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.96 : 1,358.90 = 320.95 : x
  2. Step 2: Convert to fraction form
    905.96/1,358.90 = 320.95/x
  3. Step 3: Cross multiply
    905.96x = 1,358.90 × 320.95
  4. Step 4: Simplify right side
    905.96x = 436,143.10
  5. Step 5: Solve for x
    x = 436,143.10/905.96
  6. Step 6: Final answer
    x = 481.41

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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.