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Finding the Fourth Proportional to 810.36, 1,216.08 and 445.41

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Solution

The fourth proportional to 810.36, 1,216.08 and 445.41 is: 668.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.36 : 1,216.08 = 445.41 : x
  2. Step 2: Convert to fraction form
    810.36/1,216.08 = 445.41/x
  3. Step 3: Cross multiply
    810.36x = 1,216.08 × 445.41
  4. Step 4: Simplify right side
    810.36x = 541,654.19
  5. Step 5: Solve for x
    x = 541,654.19/810.36
  6. Step 6: Final answer
    x = 668.41

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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.