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Finding the Fourth Proportional to 272.93, 409.80 and 128.75

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Solution

The fourth proportional to 272.93, 409.80 and 128.75 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.93 : 409.80 = 128.75 : x
  2. Step 2: Convert to fraction form
    272.93/409.80 = 128.75/x
  3. Step 3: Cross multiply
    272.93x = 409.80 × 128.75
  4. Step 4: Simplify right side
    272.93x = 52,761.75
  5. Step 5: Solve for x
    x = 52,761.75/272.93
  6. Step 6: Final answer
    x = 193.32

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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.