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Finding the Fourth Proportional to 281.69, 388.90 and 188.75

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Solution

The fourth proportional to 281.69, 388.90 and 188.75 is: 260.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.69 : 388.90 = 188.75 : x
  2. Step 2: Convert to fraction form
    281.69/388.90 = 188.75/x
  3. Step 3: Cross multiply
    281.69x = 388.90 × 188.75
  4. Step 4: Simplify right side
    281.69x = 73,403.90
  5. Step 5: Solve for x
    x = 73,403.90/281.69
  6. Step 6: Final answer
    x = 260.58

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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.