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Finding the Fourth Proportional to 204.95, 307.19 and 139.95

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Solution

The fourth proportional to 204.95, 307.19 and 139.95 is: 209.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.95 : 307.19 = 139.95 : x
  2. Step 2: Convert to fraction form
    204.95/307.19 = 139.95/x
  3. Step 3: Cross multiply
    204.95x = 307.19 × 139.95
  4. Step 4: Simplify right side
    204.95x = 42,991.59
  5. Step 5: Solve for x
    x = 42,991.59/204.95
  6. Step 6: Final answer
    x = 209.76

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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.