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Finding the Fourth Proportional to 206.56, 309.74 and 84.86

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Solution

The fourth proportional to 206.56, 309.74 and 84.86 is: 127.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.56 : 309.74 = 84.86 : x
  2. Step 2: Convert to fraction form
    206.56/309.74 = 84.86/x
  3. Step 3: Cross multiply
    206.56x = 309.74 × 84.86
  4. Step 4: Simplify right side
    206.56x = 26,282.56
  5. Step 5: Solve for x
    x = 26,282.56/206.56
  6. Step 6: Final answer
    x = 127.24

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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.