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Finding the Fourth Proportional to 905.19, 1,358.19 and 320.37

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Solution

The fourth proportional to 905.19, 1,358.19 and 320.37 is: 480.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.19 : 1,358.19 = 320.37 : x
  2. Step 2: Convert to fraction form
    905.19/1,358.19 = 320.37/x
  3. Step 3: Cross multiply
    905.19x = 1,358.19 × 320.37
  4. Step 4: Simplify right side
    905.19x = 435,123.33
  5. Step 5: Solve for x
    x = 435,123.33/905.19
  6. Step 6: Final answer
    x = 480.70

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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.