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Finding the Fourth Proportional to 188.61, 282.96 and 66.89

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Solution

The fourth proportional to 188.61, 282.96 and 66.89 is: 100.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.61 : 282.96 = 66.89 : x
  2. Step 2: Convert to fraction form
    188.61/282.96 = 66.89/x
  3. Step 3: Cross multiply
    188.61x = 282.96 × 66.89
  4. Step 4: Simplify right side
    188.61x = 18,925.78
  5. Step 5: Solve for x
    x = 18,925.78/188.61
  6. Step 6: Final answer
    x = 100.34

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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.