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Finding the Fourth Proportional to 205.45, 283.13 and 139.84

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Solution

The fourth proportional to 205.45, 283.13 and 139.84 is: 192.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.45 : 283.13 = 139.84 : x
  2. Step 2: Convert to fraction form
    205.45/283.13 = 139.84/x
  3. Step 3: Cross multiply
    205.45x = 283.13 × 139.84
  4. Step 4: Simplify right side
    205.45x = 39,592.02
  5. Step 5: Solve for x
    x = 39,592.02/205.45
  6. Step 6: Final answer
    x = 192.71

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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.