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Finding the Fourth Proportional to 278.69, 418.26 and 148.83

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Solution

The fourth proportional to 278.69, 418.26 and 148.83 is: 223.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.69 : 418.26 = 148.83 : x
  2. Step 2: Convert to fraction form
    278.69/418.26 = 148.83/x
  3. Step 3: Cross multiply
    278.69x = 418.26 × 148.83
  4. Step 4: Simplify right side
    278.69x = 62,249.64
  5. Step 5: Solve for x
    x = 62,249.64/278.69
  6. Step 6: Final answer
    x = 223.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.