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Finding the Fourth Proportional to 279.90, 419.90 and 135.54

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Solution

The fourth proportional to 279.90, 419.90 and 135.54 is: 203.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.90 : 419.90 = 135.54 : x
  2. Step 2: Convert to fraction form
    279.90/419.90 = 135.54/x
  3. Step 3: Cross multiply
    279.90x = 419.90 × 135.54
  4. Step 4: Simplify right side
    279.90x = 56,912.57
  5. Step 5: Solve for x
    x = 56,912.57/279.90
  6. Step 6: Final answer
    x = 203.33

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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.