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Finding the Fourth Proportional to 272.76, 409.20 and 128.48

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Solution

The fourth proportional to 272.76, 409.20 and 128.48 is: 192.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.76 : 409.20 = 128.48 : x
  2. Step 2: Convert to fraction form
    272.76/409.20 = 128.48/x
  3. Step 3: Cross multiply
    272.76x = 409.20 × 128.48
  4. Step 4: Simplify right side
    272.76x = 52,574.02
  5. Step 5: Solve for x
    x = 52,574.02/272.76
  6. Step 6: Final answer
    x = 192.75

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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.