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Finding the Fourth Proportional to 281.86, 388.63 and 222.86

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Solution

The fourth proportional to 281.86, 388.63 and 222.86 is: 307.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.86 : 388.63 = 222.86 : x
  2. Step 2: Convert to fraction form
    281.86/388.63 = 222.86/x
  3. Step 3: Cross multiply
    281.86x = 388.63 × 222.86
  4. Step 4: Simplify right side
    281.86x = 86,610.08
  5. Step 5: Solve for x
    x = 86,610.08/281.86
  6. Step 6: Final answer
    x = 307.28

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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.