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Finding the Fourth Proportional to 455.73, 628.79 and 278.67

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Solution

The fourth proportional to 455.73, 628.79 and 278.67 is: 384.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.73 : 628.79 = 278.67 : x
  2. Step 2: Convert to fraction form
    455.73/628.79 = 278.67/x
  3. Step 3: Cross multiply
    455.73x = 628.79 × 278.67
  4. Step 4: Simplify right side
    455.73x = 175,224.91
  5. Step 5: Solve for x
    x = 175,224.91/455.73
  6. Step 6: Final answer
    x = 384.49

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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.