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Finding the Fourth Proportional to 135.12, 202.68 and 74.24

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Solution

The fourth proportional to 135.12, 202.68 and 74.24 is: 111.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.12 : 202.68 = 74.24 : x
  2. Step 2: Convert to fraction form
    135.12/202.68 = 74.24/x
  3. Step 3: Cross multiply
    135.12x = 202.68 × 74.24
  4. Step 4: Simplify right side
    135.12x = 15,045.95
  5. Step 5: Solve for x
    x = 15,045.95/135.12
  6. Step 6: Final answer
    x = 111.35

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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.