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Finding the Fourth Proportional to 188.75, 260.87 and 136.50

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Solution

The fourth proportional to 188.75, 260.87 and 136.50 is: 188.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.75 : 260.87 = 136.50 : x
  2. Step 2: Convert to fraction form
    188.75/260.87 = 136.50/x
  3. Step 3: Cross multiply
    188.75x = 260.87 × 136.50
  4. Step 4: Simplify right side
    188.75x = 35,608.07
  5. Step 5: Solve for x
    x = 35,608.07/188.75
  6. Step 6: Final answer
    x = 188.66

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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.