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Finding the Fourth Proportional to 453.20, 678.45 and 404.60

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Solution

The fourth proportional to 453.20, 678.45 and 404.60 is: 605.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.20 : 678.45 = 404.60 : x
  2. Step 2: Convert to fraction form
    453.20/678.45 = 404.60/x
  3. Step 3: Cross multiply
    453.20x = 678.45 × 404.60
  4. Step 4: Simplify right side
    453.20x = 274,500.87
  5. Step 5: Solve for x
    x = 274,500.87/453.20
  6. Step 6: Final answer
    x = 605.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.