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Finding the Fourth Proportional to 206.63, 309.67 and 103.81

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Solution

The fourth proportional to 206.63, 309.67 and 103.81 is: 155.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.63 : 309.67 = 103.81 : x
  2. Step 2: Convert to fraction form
    206.63/309.67 = 103.81/x
  3. Step 3: Cross multiply
    206.63x = 309.67 × 103.81
  4. Step 4: Simplify right side
    206.63x = 32,146.10
  5. Step 5: Solve for x
    x = 32,146.10/206.63
  6. Step 6: Final answer
    x = 155.58

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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.