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Finding the Fourth Proportional to 278.72, 418.10 and 111.94

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Solution

The fourth proportional to 278.72, 418.10 and 111.94 is: 167.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.72 : 418.10 = 111.94 : x
  2. Step 2: Convert to fraction form
    278.72/418.10 = 111.94/x
  3. Step 3: Cross multiply
    278.72x = 418.10 × 111.94
  4. Step 4: Simplify right side
    278.72x = 46,804.22
  5. Step 5: Solve for x
    x = 46,804.22/278.72
  6. Step 6: Final answer
    x = 167.93

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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.