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Finding the Fourth Proportional to 188.63, 260.31 and 111.05

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Solution

The fourth proportional to 188.63, 260.31 and 111.05 is: 153.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.63 : 260.31 = 111.05 : x
  2. Step 2: Convert to fraction form
    188.63/260.31 = 111.05/x
  3. Step 3: Cross multiply
    188.63x = 260.31 × 111.05
  4. Step 4: Simplify right side
    188.63x = 28,906.12
  5. Step 5: Solve for x
    x = 28,906.12/188.63
  6. Step 6: Final answer
    x = 153.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.