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Finding the Fourth Proportional to 188.89, 260.64 and 111.25

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Solution

The fourth proportional to 188.89, 260.64 and 111.25 is: 153.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.89 : 260.64 = 111.25 : x
  2. Step 2: Convert to fraction form
    188.89/260.64 = 111.25/x
  3. Step 3: Cross multiply
    188.89x = 260.64 × 111.25
  4. Step 4: Simplify right side
    188.89x = 28,996.20
  5. Step 5: Solve for x
    x = 28,996.20/188.89
  6. Step 6: Final answer
    x = 153.51

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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.