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Finding the Fourth Proportional to 206.56, 309.88 and 103.90

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Solution

The fourth proportional to 206.56, 309.88 and 103.90 is: 155.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.56 : 309.88 = 103.90 : x
  2. Step 2: Convert to fraction form
    206.56/309.88 = 103.90/x
  3. Step 3: Cross multiply
    206.56x = 309.88 × 103.90
  4. Step 4: Simplify right side
    206.56x = 32,196.53
  5. Step 5: Solve for x
    x = 32,196.53/206.56
  6. Step 6: Final answer
    x = 155.87

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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.