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Finding the Fourth Proportional to 206.43, 309.53 and 90.74

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Solution

The fourth proportional to 206.43, 309.53 and 90.74 is: 136.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.43 : 309.53 = 90.74 : x
  2. Step 2: Convert to fraction form
    206.43/309.53 = 90.74/x
  3. Step 3: Cross multiply
    206.43x = 309.53 × 90.74
  4. Step 4: Simplify right side
    206.43x = 28,087.09
  5. Step 5: Solve for x
    x = 28,087.09/206.43
  6. Step 6: Final answer
    x = 136.06

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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.