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Finding the Fourth Proportional to 455.50, 628.62 and 280.76

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Solution

The fourth proportional to 455.50, 628.62 and 280.76 is: 387.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.50 : 628.62 = 280.76 : x
  2. Step 2: Convert to fraction form
    455.50/628.62 = 280.76/x
  3. Step 3: Cross multiply
    455.50x = 628.62 × 280.76
  4. Step 4: Simplify right side
    455.50x = 176,491.35
  5. Step 5: Solve for x
    x = 176,491.35/455.50
  6. Step 6: Final answer
    x = 387.47

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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.