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Finding the Fourth Proportional to 278.70, 384.45 and 223.72

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Solution

The fourth proportional to 278.70, 384.45 and 223.72 is: 308.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.70 : 384.45 = 223.72 : x
  2. Step 2: Convert to fraction form
    278.70/384.45 = 223.72/x
  3. Step 3: Cross multiply
    278.70x = 384.45 × 223.72
  4. Step 4: Simplify right side
    278.70x = 86,009.15
  5. Step 5: Solve for x
    x = 86,009.15/278.70
  6. Step 6: Final answer
    x = 308.61

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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.