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Finding the Fourth Proportional to 189.98, 262.05 and 127.89

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Solution

The fourth proportional to 189.98, 262.05 and 127.89 is: 176.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.98 : 262.05 = 127.89 : x
  2. Step 2: Convert to fraction form
    189.98/262.05 = 127.89/x
  3. Step 3: Cross multiply
    189.98x = 262.05 × 127.89
  4. Step 4: Simplify right side
    189.98x = 33,513.57
  5. Step 5: Solve for x
    x = 33,513.57/189.98
  6. Step 6: Final answer
    x = 176.41

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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.