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Finding the Fourth Proportional to 203.85, 305.06 and 139.77

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Solution

The fourth proportional to 203.85, 305.06 and 139.77 is: 209.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.85 : 305.06 = 139.77 : x
  2. Step 2: Convert to fraction form
    203.85/305.06 = 139.77/x
  3. Step 3: Cross multiply
    203.85x = 305.06 × 139.77
  4. Step 4: Simplify right side
    203.85x = 42,637.54
  5. Step 5: Solve for x
    x = 42,637.54/203.85
  6. Step 6: Final answer
    x = 209.16

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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.