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Finding the Fourth Proportional to 280.56, 386.76 and 222.36

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Solution

The fourth proportional to 280.56, 386.76 and 222.36 is: 306.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.56 : 386.76 = 222.36 : x
  2. Step 2: Convert to fraction form
    280.56/386.76 = 222.36/x
  3. Step 3: Cross multiply
    280.56x = 386.76 × 222.36
  4. Step 4: Simplify right side
    280.56x = 85,999.95
  5. Step 5: Solve for x
    x = 85,999.95/280.56
  6. Step 6: Final answer
    x = 306.53

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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.