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Finding the Fourth Proportional to 188.78, 282.90 and 163.40

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Solution

The fourth proportional to 188.78, 282.90 and 163.40 is: 244.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.78 : 282.90 = 163.40 : x
  2. Step 2: Convert to fraction form
    188.78/282.90 = 163.40/x
  3. Step 3: Cross multiply
    188.78x = 282.90 × 163.40
  4. Step 4: Simplify right side
    188.78x = 46,225.86
  5. Step 5: Solve for x
    x = 46,225.86/188.78
  6. Step 6: Final answer
    x = 244.87

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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.