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Finding the Fourth Proportional to 142.39, 213.58 and 133.48

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Solution

The fourth proportional to 142.39, 213.58 and 133.48 is: 200.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.39 : 213.58 = 133.48 : x
  2. Step 2: Convert to fraction form
    142.39/213.58 = 133.48/x
  3. Step 3: Cross multiply
    142.39x = 213.58 × 133.48
  4. Step 4: Simplify right side
    142.39x = 28,507.59
  5. Step 5: Solve for x
    x = 28,507.59/142.39
  6. Step 6: Final answer
    x = 200.21

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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.