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Finding the Fourth Proportional to 278.22, 383.78 and 189.69

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Solution

The fourth proportional to 278.22, 383.78 and 189.69 is: 261.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.22 : 383.78 = 189.69 : x
  2. Step 2: Convert to fraction form
    278.22/383.78 = 189.69/x
  3. Step 3: Cross multiply
    278.22x = 383.78 × 189.69
  4. Step 4: Simplify right side
    278.22x = 72,799.23
  5. Step 5: Solve for x
    x = 72,799.23/278.22
  6. Step 6: Final answer
    x = 261.66

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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.