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Finding the Fourth Proportional to 206.01, 309.08 and 90.55

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Solution

The fourth proportional to 206.01, 309.08 and 90.55 is: 135.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.01 : 309.08 = 90.55 : x
  2. Step 2: Convert to fraction form
    206.01/309.08 = 90.55/x
  3. Step 3: Cross multiply
    206.01x = 309.08 × 90.55
  4. Step 4: Simplify right side
    206.01x = 27,988.33
  5. Step 5: Solve for x
    x = 27,988.33/206.01
  6. Step 6: Final answer
    x = 135.86

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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.