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Finding the Fourth Proportional to 905.46, 1,358.61 and 320.90

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Solution

The fourth proportional to 905.46, 1,358.61 and 320.90 is: 481.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.46 : 1,358.61 = 320.90 : x
  2. Step 2: Convert to fraction form
    905.46/1,358.61 = 320.90/x
  3. Step 3: Cross multiply
    905.46x = 1,358.61 × 320.90
  4. Step 4: Simplify right side
    905.46x = 435,981.35
  5. Step 5: Solve for x
    x = 435,981.35/905.46
  6. Step 6: Final answer
    x = 481.50

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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.