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Finding the Fourth Proportional to 905.34, 1,358.21 and 320.32

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Solution

The fourth proportional to 905.34, 1,358.21 and 320.32 is: 480.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.34 : 1,358.21 = 320.32 : x
  2. Step 2: Convert to fraction form
    905.34/1,358.21 = 320.32/x
  3. Step 3: Cross multiply
    905.34x = 1,358.21 × 320.32
  4. Step 4: Simplify right side
    905.34x = 435,061.83
  5. Step 5: Solve for x
    x = 435,061.83/905.34
  6. Step 6: Final answer
    x = 480.55

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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.