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Finding the Fourth Proportional to 203.07, 304.77 and 81.42

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Solution

The fourth proportional to 203.07, 304.77 and 81.42 is: 122.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.07 : 304.77 = 81.42 : x
  2. Step 2: Convert to fraction form
    203.07/304.77 = 81.42/x
  3. Step 3: Cross multiply
    203.07x = 304.77 × 81.42
  4. Step 4: Simplify right side
    203.07x = 24,814.37
  5. Step 5: Solve for x
    x = 24,814.37/203.07
  6. Step 6: Final answer
    x = 122.20

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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.