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Finding the Fourth Proportional to 189.51, 284.37 and 143.85

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Solution

The fourth proportional to 189.51, 284.37 and 143.85 is: 215.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.51 : 284.37 = 143.85 : x
  2. Step 2: Convert to fraction form
    189.51/284.37 = 143.85/x
  3. Step 3: Cross multiply
    189.51x = 284.37 × 143.85
  4. Step 4: Simplify right side
    189.51x = 40,906.62
  5. Step 5: Solve for x
    x = 40,906.62/189.51
  6. Step 6: Final answer
    x = 215.85

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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.