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Finding the Fourth Proportional to 142.02, 212.79 and 136.69

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Solution

The fourth proportional to 142.02, 212.79 and 136.69 is: 204.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.02 : 212.79 = 136.69 : x
  2. Step 2: Convert to fraction form
    142.02/212.79 = 136.69/x
  3. Step 3: Cross multiply
    142.02x = 212.79 × 136.69
  4. Step 4: Simplify right side
    142.02x = 29,086.27
  5. Step 5: Solve for x
    x = 29,086.27/142.02
  6. Step 6: Final answer
    x = 204.80

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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.