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Finding the Fourth Proportional to 142.56, 213.52 and 135.68

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Solution

The fourth proportional to 142.56, 213.52 and 135.68 is: 203.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.56 : 213.52 = 135.68 : x
  2. Step 2: Convert to fraction form
    142.56/213.52 = 135.68/x
  3. Step 3: Cross multiply
    142.56x = 213.52 × 135.68
  4. Step 4: Simplify right side
    142.56x = 28,970.39
  5. Step 5: Solve for x
    x = 28,970.39/142.56
  6. Step 6: Final answer
    x = 203.22

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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.