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Finding the Fourth Proportional to 189.61, 284.51 and 81.47

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Solution

The fourth proportional to 189.61, 284.51 and 81.47 is: 122.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.61 : 284.51 = 81.47 : x
  2. Step 2: Convert to fraction form
    189.61/284.51 = 81.47/x
  3. Step 3: Cross multiply
    189.61x = 284.51 × 81.47
  4. Step 4: Simplify right side
    189.61x = 23,179.94
  5. Step 5: Solve for x
    x = 23,179.94/189.61
  6. Step 6: Final answer
    x = 122.25

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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.