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Finding the Fourth Proportional to 189.21, 283.79 and 65.81

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Solution

The fourth proportional to 189.21, 283.79 and 65.81 is: 98.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.21 : 283.79 = 65.81 : x
  2. Step 2: Convert to fraction form
    189.21/283.79 = 65.81/x
  3. Step 3: Cross multiply
    189.21x = 283.79 × 65.81
  4. Step 4: Simplify right side
    189.21x = 18,675.50
  5. Step 5: Solve for x
    x = 18,675.50/189.21
  6. Step 6: Final answer
    x = 98.70

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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.