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Finding the Fourth Proportional to 206.74, 309.84 and 138.07

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Solution

The fourth proportional to 206.74, 309.84 and 138.07 is: 206.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.74 : 309.84 = 138.07 : x
  2. Step 2: Convert to fraction form
    206.74/309.84 = 138.07/x
  3. Step 3: Cross multiply
    206.74x = 309.84 × 138.07
  4. Step 4: Simplify right side
    206.74x = 42,779.61
  5. Step 5: Solve for x
    x = 42,779.61/206.74
  6. Step 6: Final answer
    x = 206.92

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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.