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Finding the Fourth Proportional to 315.77, 435.78 and 205.34

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Solution

The fourth proportional to 315.77, 435.78 and 205.34 is: 283.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.77 : 435.78 = 205.34 : x
  2. Step 2: Convert to fraction form
    315.77/435.78 = 205.34/x
  3. Step 3: Cross multiply
    315.77x = 435.78 × 205.34
  4. Step 4: Simplify right side
    315.77x = 89,480.89
  5. Step 5: Solve for x
    x = 89,480.89/315.77
  6. Step 6: Final answer
    x = 283.38

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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.