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Finding the Fourth Proportional to 278.26, 383.93 and 211.85

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Solution

The fourth proportional to 278.26, 383.93 and 211.85 is: 292.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.26 : 383.93 = 211.85 : x
  2. Step 2: Convert to fraction form
    278.26/383.93 = 211.85/x
  3. Step 3: Cross multiply
    278.26x = 383.93 × 211.85
  4. Step 4: Simplify right side
    278.26x = 81,337.06
  5. Step 5: Solve for x
    x = 81,337.06/278.26
  6. Step 6: Final answer
    x = 292.31

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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.