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Finding the Fourth Proportional to 206.10, 309.27 and 90.54

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Solution

The fourth proportional to 206.10, 309.27 and 90.54 is: 135.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.10 : 309.27 = 90.54 : x
  2. Step 2: Convert to fraction form
    206.10/309.27 = 90.54/x
  3. Step 3: Cross multiply
    206.10x = 309.27 × 90.54
  4. Step 4: Simplify right side
    206.10x = 28,001.31
  5. Step 5: Solve for x
    x = 28,001.31/206.10
  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.