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Finding the Fourth Proportional to 188.43, 282.72 and 66.78

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Solution

The fourth proportional to 188.43, 282.72 and 66.78 is: 100.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.43 : 282.72 = 66.78 : x
  2. Step 2: Convert to fraction form
    188.43/282.72 = 66.78/x
  3. Step 3: Cross multiply
    188.43x = 282.72 × 66.78
  4. Step 4: Simplify right side
    188.43x = 18,880.04
  5. Step 5: Solve for x
    x = 18,880.04/188.43
  6. Step 6: Final answer
    x = 100.20

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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.