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Finding the Fourth Proportional to 142.56, 212.69 and 135.68

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Solution

The fourth proportional to 142.56, 212.69 and 135.68 is: 202.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.56 : 212.69 = 135.68 : x
  2. Step 2: Convert to fraction form
    142.56/212.69 = 135.68/x
  3. Step 3: Cross multiply
    142.56x = 212.69 × 135.68
  4. Step 4: Simplify right side
    142.56x = 28,857.05
  5. Step 5: Solve for x
    x = 28,857.05/142.56
  6. Step 6: Final answer
    x = 202.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.