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Finding the Fourth Proportional to 309.94, 427.56 and 205.18

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Solution

The fourth proportional to 309.94, 427.56 and 205.18 is: 283.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.94 : 427.56 = 205.18 : x
  2. Step 2: Convert to fraction form
    309.94/427.56 = 205.18/x
  3. Step 3: Cross multiply
    309.94x = 427.56 × 205.18
  4. Step 4: Simplify right side
    309.94x = 87,726.76
  5. Step 5: Solve for x
    x = 87,726.76/309.94
  6. Step 6: Final answer
    x = 283.04

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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.