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Finding the Fourth Proportional to 272.94, 409.59 and 128.67

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Solution

The fourth proportional to 272.94, 409.59 and 128.67 is: 193.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.94 : 409.59 = 128.67 : x
  2. Step 2: Convert to fraction form
    272.94/409.59 = 128.67/x
  3. Step 3: Cross multiply
    272.94x = 409.59 × 128.67
  4. Step 4: Simplify right side
    272.94x = 52,701.95
  5. Step 5: Solve for x
    x = 52,701.95/272.94
  6. Step 6: Final answer
    x = 193.09

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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.