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Finding the Fourth Proportional to 135.72, 203.55 and 53.43

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Solution

The fourth proportional to 135.72, 203.55 and 53.43 is: 80.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.72 : 203.55 = 53.43 : x
  2. Step 2: Convert to fraction form
    135.72/203.55 = 53.43/x
  3. Step 3: Cross multiply
    135.72x = 203.55 × 53.43
  4. Step 4: Simplify right side
    135.72x = 10,875.68
  5. Step 5: Solve for x
    x = 10,875.68/135.72
  6. Step 6: Final answer
    x = 80.13

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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.