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Finding the Fourth Proportional to 603.93, 905.28 and 213.81

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Solution

The fourth proportional to 603.93, 905.28 and 213.81 is: 320.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.93 : 905.28 = 213.81 : x
  2. Step 2: Convert to fraction form
    603.93/905.28 = 213.81/x
  3. Step 3: Cross multiply
    603.93x = 905.28 × 213.81
  4. Step 4: Simplify right side
    603.93x = 193,557.92
  5. Step 5: Solve for x
    x = 193,557.92/603.93
  6. Step 6: Final answer
    x = 320.50

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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.