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Finding the Fourth Proportional to 278.98, 384.74 and 223.69

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Solution

The fourth proportional to 278.98, 384.74 and 223.69 is: 308.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.98 : 384.74 = 223.69 : x
  2. Step 2: Convert to fraction form
    278.98/384.74 = 223.69/x
  3. Step 3: Cross multiply
    278.98x = 384.74 × 223.69
  4. Step 4: Simplify right side
    278.98x = 86,062.49
  5. Step 5: Solve for x
    x = 86,062.49/278.98
  6. Step 6: Final answer
    x = 308.49

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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.