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Finding the Fourth Proportional to 409.18, 613.78 and 135.29

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Solution

The fourth proportional to 409.18, 613.78 and 135.29 is: 202.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.18 : 613.78 = 135.29 : x
  2. Step 2: Convert to fraction form
    409.18/613.78 = 135.29/x
  3. Step 3: Cross multiply
    409.18x = 613.78 × 135.29
  4. Step 4: Simplify right side
    409.18x = 83,038.30
  5. Step 5: Solve for x
    x = 83,038.30/409.18
  6. Step 6: Final answer
    x = 202.94

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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.