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Finding the Fourth Proportional to 603.52, 905.38 and 213.75

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Solution

The fourth proportional to 603.52, 905.38 and 213.75 is: 320.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.52 : 905.38 = 213.75 : x
  2. Step 2: Convert to fraction form
    603.52/905.38 = 213.75/x
  3. Step 3: Cross multiply
    603.52x = 905.38 × 213.75
  4. Step 4: Simplify right side
    603.52x = 193,521.34
  5. Step 5: Solve for x
    x = 193,521.34/603.52
  6. Step 6: Final answer
    x = 320.66

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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.