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Finding the Fourth Proportional to 203.90, 305.67 and 82.10

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Solution

The fourth proportional to 203.90, 305.67 and 82.10 is: 123.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.90 : 305.67 = 82.10 : x
  2. Step 2: Convert to fraction form
    203.90/305.67 = 82.10/x
  3. Step 3: Cross multiply
    203.90x = 305.67 × 82.10
  4. Step 4: Simplify right side
    203.90x = 25,095.51
  5. Step 5: Solve for x
    x = 25,095.51/203.90
  6. Step 6: Final answer
    x = 123.08

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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.