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Finding the Fourth Proportional to 189.98, 262.16 and 120.05

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Solution

The fourth proportional to 189.98, 262.16 and 120.05 is: 165.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.98 : 262.16 = 120.05 : x
  2. Step 2: Convert to fraction form
    189.98/262.16 = 120.05/x
  3. Step 3: Cross multiply
    189.98x = 262.16 × 120.05
  4. Step 4: Simplify right side
    189.98x = 31,470.40
  5. Step 5: Solve for x
    x = 31,470.40/189.98
  6. Step 6: Final answer
    x = 165.66

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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.