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Finding the Fourth Proportional to 278.26, 383.75 and 222.97

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Solution

The fourth proportional to 278.26, 383.75 and 222.97 is: 307.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.26 : 383.75 = 222.97 : x
  2. Step 2: Convert to fraction form
    278.26/383.75 = 222.97/x
  3. Step 3: Cross multiply
    278.26x = 383.75 × 222.97
  4. Step 4: Simplify right side
    278.26x = 85,564.74
  5. Step 5: Solve for x
    x = 85,564.74/278.26
  6. Step 6: Final answer
    x = 307.50

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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.