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Finding the Fourth Proportional to 206.42, 309.35 and 114.95

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Solution

The fourth proportional to 206.42, 309.35 and 114.95 is: 172.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.42 : 309.35 = 114.95 : x
  2. Step 2: Convert to fraction form
    206.42/309.35 = 114.95/x
  3. Step 3: Cross multiply
    206.42x = 309.35 × 114.95
  4. Step 4: Simplify right side
    206.42x = 35,560.84
  5. Step 5: Solve for x
    x = 35,560.84/206.42
  6. Step 6: Final answer
    x = 172.28

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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.