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Finding the Fourth Proportional to 189.85, 284.80 and 81.63

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Solution

The fourth proportional to 189.85, 284.80 and 81.63 is: 122.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.85 : 284.80 = 81.63 : x
  2. Step 2: Convert to fraction form
    189.85/284.80 = 81.63/x
  3. Step 3: Cross multiply
    189.85x = 284.80 × 81.63
  4. Step 4: Simplify right side
    189.85x = 23,248.22
  5. Step 5: Solve for x
    x = 23,248.22/189.85
  6. Step 6: Final answer
    x = 122.46

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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.