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Finding the Fourth Proportional to 135.54, 203.48 and 74.80

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Solution

The fourth proportional to 135.54, 203.48 and 74.80 is: 112.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.54 : 203.48 = 74.80 : x
  2. Step 2: Convert to fraction form
    135.54/203.48 = 74.80/x
  3. Step 3: Cross multiply
    135.54x = 203.48 × 74.80
  4. Step 4: Simplify right side
    135.54x = 15,220.30
  5. Step 5: Solve for x
    x = 15,220.30/135.54
  6. Step 6: Final answer
    x = 112.29

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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.