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Finding the Fourth Proportional to 135.56, 203.20 and 74.67

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Solution

The fourth proportional to 135.56, 203.20 and 74.67 is: 111.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.56 : 203.20 = 74.67 : x
  2. Step 2: Convert to fraction form
    135.56/203.20 = 74.67/x
  3. Step 3: Cross multiply
    135.56x = 203.20 × 74.67
  4. Step 4: Simplify right side
    135.56x = 15,172.76
  5. Step 5: Solve for x
    x = 15,172.76/135.56
  6. Step 6: Final answer
    x = 111.93

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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.