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Finding the Fourth Proportional to 315.89, 435.78 and 205.38

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Solution

The fourth proportional to 315.89, 435.78 and 205.38 is: 283.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.89 : 435.78 = 205.38 : x
  2. Step 2: Convert to fraction form
    315.89/435.78 = 205.38/x
  3. Step 3: Cross multiply
    315.89x = 435.78 × 205.38
  4. Step 4: Simplify right side
    315.89x = 89,500.50
  5. Step 5: Solve for x
    x = 89,500.50/315.89
  6. Step 6: Final answer
    x = 283.33

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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.