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Finding the Fourth Proportional to 205.12, 307.90 and 83.46

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Solution

The fourth proportional to 205.12, 307.90 and 83.46 is: 125.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.12 : 307.90 = 83.46 : x
  2. Step 2: Convert to fraction form
    205.12/307.90 = 83.46/x
  3. Step 3: Cross multiply
    205.12x = 307.90 × 83.46
  4. Step 4: Simplify right side
    205.12x = 25,698.59
  5. Step 5: Solve for x
    x = 25,698.59/205.12
  6. Step 6: Final answer
    x = 125.28

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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.