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Finding the Fourth Proportional to 427.06, 640.43 and 166.85

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Solution

The fourth proportional to 427.06, 640.43 and 166.85 is: 250.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.06 : 640.43 = 166.85 : x
  2. Step 2: Convert to fraction form
    427.06/640.43 = 166.85/x
  3. Step 3: Cross multiply
    427.06x = 640.43 × 166.85
  4. Step 4: Simplify right side
    427.06x = 106,851.71
  5. Step 5: Solve for x
    x = 106,851.71/427.06
  6. Step 6: Final answer
    x = 250.21

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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.