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Finding the Fourth Proportional to 278.22, 383.76 and 219.90

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Solution

The fourth proportional to 278.22, 383.76 and 219.90 is: 303.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.22 : 383.76 = 219.90 : x
  2. Step 2: Convert to fraction form
    278.22/383.76 = 219.90/x
  3. Step 3: Cross multiply
    278.22x = 383.76 × 219.90
  4. Step 4: Simplify right side
    278.22x = 84,388.82
  5. Step 5: Solve for x
    x = 84,388.82/278.22
  6. Step 6: Final answer
    x = 303.32

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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.