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Finding the Fourth Proportional to 278.76, 384.45 and 173.74

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Solution

The fourth proportional to 278.76, 384.45 and 173.74 is: 239.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.76 : 384.45 = 173.74 : x
  2. Step 2: Convert to fraction form
    278.76/384.45 = 173.74/x
  3. Step 3: Cross multiply
    278.76x = 384.45 × 173.74
  4. Step 4: Simplify right side
    278.76x = 66,792.37
  5. Step 5: Solve for x
    x = 66,792.37/278.76
  6. Step 6: Final answer
    x = 239.61

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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.