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Finding the Fourth Proportional to 272.16, 408.21 and 89.55

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Solution

The fourth proportional to 272.16, 408.21 and 89.55 is: 134.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.16 : 408.21 = 89.55 : x
  2. Step 2: Convert to fraction form
    272.16/408.21 = 89.55/x
  3. Step 3: Cross multiply
    272.16x = 408.21 × 89.55
  4. Step 4: Simplify right side
    272.16x = 36,555.21
  5. Step 5: Solve for x
    x = 36,555.21/272.16
  6. Step 6: Final answer
    x = 134.32

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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.