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Finding the Fourth Proportional to 205.49, 307.94 and 140.49

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Solution

The fourth proportional to 205.49, 307.94 and 140.49 is: 210.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.49 : 307.94 = 140.49 : x
  2. Step 2: Convert to fraction form
    205.49/307.94 = 140.49/x
  3. Step 3: Cross multiply
    205.49x = 307.94 × 140.49
  4. Step 4: Simplify right side
    205.49x = 43,261.79
  5. Step 5: Solve for x
    x = 43,261.79/205.49
  6. Step 6: Final answer
    x = 210.53

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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.