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Finding the Fourth Proportional to 135, 202.38 and 53.80

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Solution

The fourth proportional to 135, 202.38 and 53.80 is: 80.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    135 : 202.38 = 53.80 : x
  2. Step 2: Convert to fraction form
    135/202.38 = 53.80/x
  3. Step 3: Cross multiply
    135x = 202.38 × 53.80
  4. Step 4: Simplify right side
    135x = 10,888.04
  5. Step 5: Solve for x
    x = 10,888.04/135
  6. Step 6: Final answer
    x = 80.65

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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.