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Finding the Fourth Proportional to 278.58, 384.45 and 173.67

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Solution

The fourth proportional to 278.58, 384.45 and 173.67 is: 239.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.58 : 384.45 = 173.67 : x
  2. Step 2: Convert to fraction form
    278.58/384.45 = 173.67/x
  3. Step 3: Cross multiply
    278.58x = 384.45 × 173.67
  4. Step 4: Simplify right side
    278.58x = 66,767.43
  5. Step 5: Solve for x
    x = 66,767.43/278.58
  6. Step 6: Final answer
    x = 239.67

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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.