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Finding the Fourth Proportional to 272.21, 407.77 and 128.03

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Solution

The fourth proportional to 272.21, 407.77 and 128.03 is: 191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.21 : 407.77 = 128.03 : x
  2. Step 2: Convert to fraction form
    272.21/407.77 = 128.03/x
  3. Step 3: Cross multiply
    272.21x = 407.77 × 128.03
  4. Step 4: Simplify right side
    272.21x = 52,204.43
  5. Step 5: Solve for x
    x = 52,204.43/272.21
  6. Step 6: Final answer
    x = 191.78

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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.