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Finding the Fourth Proportional to 206.14, 309.12 and 123.70

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Solution

The fourth proportional to 206.14, 309.12 and 123.70 is: 185.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.14 : 309.12 = 123.70 : x
  2. Step 2: Convert to fraction form
    206.14/309.12 = 123.70/x
  3. Step 3: Cross multiply
    206.14x = 309.12 × 123.70
  4. Step 4: Simplify right side
    206.14x = 38,238.14
  5. Step 5: Solve for x
    x = 38,238.14/206.14
  6. Step 6: Final answer
    x = 185.50

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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.