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Finding the Fourth Proportional to 207.82, 309.51 and 206.61

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Solution

The fourth proportional to 207.82, 309.51 and 206.61 is: 307.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.82 : 309.51 = 206.61 : x
  2. Step 2: Convert to fraction form
    207.82/309.51 = 206.61/x
  3. Step 3: Cross multiply
    207.82x = 309.51 × 206.61
  4. Step 4: Simplify right side
    207.82x = 63,947.86
  5. Step 5: Solve for x
    x = 63,947.86/207.82
  6. Step 6: Final answer
    x = 307.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.