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Finding the Fourth Proportional to 134.90, 202.60 and 128.90

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Solution

The fourth proportional to 134.90, 202.60 and 128.90 is: 193.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.90 : 202.60 = 128.90 : x
  2. Step 2: Convert to fraction form
    134.90/202.60 = 128.90/x
  3. Step 3: Cross multiply
    134.90x = 202.60 × 128.90
  4. Step 4: Simplify right side
    134.90x = 26,115.14
  5. Step 5: Solve for x
    x = 26,115.14/134.90
  6. Step 6: Final answer
    x = 193.59

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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.