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Finding the Fourth Proportional to 188.21, 282.35 and 66.46

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Solution

The fourth proportional to 188.21, 282.35 and 66.46 is: 99.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.21 : 282.35 = 66.46 : x
  2. Step 2: Convert to fraction form
    188.21/282.35 = 66.46/x
  3. Step 3: Cross multiply
    188.21x = 282.35 × 66.46
  4. Step 4: Simplify right side
    188.21x = 18,764.98
  5. Step 5: Solve for x
    x = 18,764.98/188.21
  6. Step 6: Final answer
    x = 99.70

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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.