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Finding the Fourth Proportional to 205, 282.80 and 126.34

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Solution

The fourth proportional to 205, 282.80 and 126.34 is: 174.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    205 : 282.80 = 126.34 : x
  2. Step 2: Convert to fraction form
    205/282.80 = 126.34/x
  3. Step 3: Cross multiply
    205x = 282.80 × 126.34
  4. Step 4: Simplify right side
    205x = 35,728.95
  5. Step 5: Solve for x
    x = 35,728.95/205
  6. Step 6: Final answer
    x = 174.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.