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Finding the Fourth Proportional to 278.10, 383.49 and 215.82

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Solution

The fourth proportional to 278.10, 383.49 and 215.82 is: 297.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.10 : 383.49 = 215.82 : x
  2. Step 2: Convert to fraction form
    278.10/383.49 = 215.82/x
  3. Step 3: Cross multiply
    278.10x = 383.49 × 215.82
  4. Step 4: Simplify right side
    278.10x = 82,764.81
  5. Step 5: Solve for x
    x = 82,764.81/278.10
  6. Step 6: Final answer
    x = 297.61

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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.