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Finding the Fourth Proportional to 409.33, 613.93 and 135.43

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Solution

The fourth proportional to 409.33, 613.93 and 135.43 is: 203.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.33 : 613.93 = 135.43 : x
  2. Step 2: Convert to fraction form
    409.33/613.93 = 135.43/x
  3. Step 3: Cross multiply
    409.33x = 613.93 × 135.43
  4. Step 4: Simplify right side
    409.33x = 83,144.54
  5. Step 5: Solve for x
    x = 83,144.54/409.33
  6. Step 6: Final answer
    x = 203.12

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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.