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Finding the Fourth Proportional to 278.68, 384.94 and 239.74

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Solution

The fourth proportional to 278.68, 384.94 and 239.74 is: 331.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.68 : 384.94 = 239.74 : x
  2. Step 2: Convert to fraction form
    278.68/384.94 = 239.74/x
  3. Step 3: Cross multiply
    278.68x = 384.94 × 239.74
  4. Step 4: Simplify right side
    278.68x = 92,285.52
  5. Step 5: Solve for x
    x = 92,285.52/278.68
  6. Step 6: Final answer
    x = 331.15

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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.