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Finding the Fourth Proportional to 213.80, 295.02 and 120.55

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Solution

The fourth proportional to 213.80, 295.02 and 120.55 is: 166.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.80 : 295.02 = 120.55 : x
  2. Step 2: Convert to fraction form
    213.80/295.02 = 120.55/x
  3. Step 3: Cross multiply
    213.80x = 295.02 × 120.55
  4. Step 4: Simplify right side
    213.80x = 35,564.06
  5. Step 5: Solve for x
    x = 35,564.06/213.80
  6. Step 6: Final answer
    x = 166.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.