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Finding the Fourth Proportional to 136.61, 204.74 and 67.99

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Solution

The fourth proportional to 136.61, 204.74 and 67.99 is: 101.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.61 : 204.74 = 67.99 : x
  2. Step 2: Convert to fraction form
    136.61/204.74 = 67.99/x
  3. Step 3: Cross multiply
    136.61x = 204.74 × 67.99
  4. Step 4: Simplify right side
    136.61x = 13,919.93
  5. Step 5: Solve for x
    x = 13,919.93/136.61
  6. Step 6: Final answer
    x = 101.89

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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.