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Finding the Fourth Proportional to 135.72, 203.44 and 71.52

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Solution

The fourth proportional to 135.72, 203.44 and 71.52 is: 107.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.72 : 203.44 = 71.52 : x
  2. Step 2: Convert to fraction form
    135.72/203.44 = 71.52/x
  3. Step 3: Cross multiply
    135.72x = 203.44 × 71.52
  4. Step 4: Simplify right side
    135.72x = 14,550.03
  5. Step 5: Solve for x
    x = 14,550.03/135.72
  6. Step 6: Final answer
    x = 107.21

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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.