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Finding the Fourth Proportional to 206.04, 308.47 and 128.77

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Solution

The fourth proportional to 206.04, 308.47 and 128.77 is: 192.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.04 : 308.47 = 128.77 : x
  2. Step 2: Convert to fraction form
    206.04/308.47 = 128.77/x
  3. Step 3: Cross multiply
    206.04x = 308.47 × 128.77
  4. Step 4: Simplify right side
    206.04x = 39,721.68
  5. Step 5: Solve for x
    x = 39,721.68/206.04
  6. Step 6: Final answer
    x = 192.79

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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.