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Finding the Fourth Proportional to 133.53, 200.34 and 90.15

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Solution

The fourth proportional to 133.53, 200.34 and 90.15 is: 135.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.53 : 200.34 = 90.15 : x
  2. Step 2: Convert to fraction form
    133.53/200.34 = 90.15/x
  3. Step 3: Cross multiply
    133.53x = 200.34 × 90.15
  4. Step 4: Simplify right side
    133.53x = 18,060.65
  5. Step 5: Solve for x
    x = 18,060.65/133.53
  6. Step 6: Final answer
    x = 135.26

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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.