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Finding the Fourth Proportional to 206.01, 308.48 and 128.66

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Solution

The fourth proportional to 206.01, 308.48 and 128.66 is: 192.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.01 : 308.48 = 128.66 : x
  2. Step 2: Convert to fraction form
    206.01/308.48 = 128.66/x
  3. Step 3: Cross multiply
    206.01x = 308.48 × 128.66
  4. Step 4: Simplify right side
    206.01x = 39,686.85
  5. Step 5: Solve for x
    x = 39,686.85/206.01
  6. Step 6: Final answer
    x = 192.65

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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.