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Finding the Fourth Proportional to 319.50, 440.91 and 203.13

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Solution

The fourth proportional to 319.50, 440.91 and 203.13 is: 280.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.50 : 440.91 = 203.13 : x
  2. Step 2: Convert to fraction form
    319.50/440.91 = 203.13/x
  3. Step 3: Cross multiply
    319.50x = 440.91 × 203.13
  4. Step 4: Simplify right side
    319.50x = 89,562.05
  5. Step 5: Solve for x
    x = 89,562.05/319.50
  6. Step 6: Final answer
    x = 280.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.