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Finding the Fourth Proportional to 135.10, 202.80 and 74.28

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Solution

The fourth proportional to 135.10, 202.80 and 74.28 is: 111.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.10 : 202.80 = 74.28 : x
  2. Step 2: Convert to fraction form
    135.10/202.80 = 74.28/x
  3. Step 3: Cross multiply
    135.10x = 202.80 × 74.28
  4. Step 4: Simplify right side
    135.10x = 15,065.02
  5. Step 5: Solve for x
    x = 15,065.02/135.10
  6. Step 6: Final answer
    x = 111.51

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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.