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Finding the Fourth Proportional to 445.83, 665.44 and 418.47

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Solution

The fourth proportional to 445.83, 665.44 and 418.47 is: 624.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.83 : 665.44 = 418.47 : x
  2. Step 2: Convert to fraction form
    445.83/665.44 = 418.47/x
  3. Step 3: Cross multiply
    445.83x = 665.44 × 418.47
  4. Step 4: Simplify right side
    445.83x = 278,466.68
  5. Step 5: Solve for x
    x = 278,466.68/445.83
  6. Step 6: Final answer
    x = 624.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.