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Finding the Fourth Proportional to 203.10, 304.46 and 81.28

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Solution

The fourth proportional to 203.10, 304.46 and 81.28 is: 121.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.10 : 304.46 = 81.28 : x
  2. Step 2: Convert to fraction form
    203.10/304.46 = 81.28/x
  3. Step 3: Cross multiply
    203.10x = 304.46 × 81.28
  4. Step 4: Simplify right side
    203.10x = 24,746.51
  5. Step 5: Solve for x
    x = 24,746.51/203.10
  6. Step 6: Final answer
    x = 121.84

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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.