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Finding the Fourth Proportional to 811.37, 1,216.14 and 399.63

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Solution

The fourth proportional to 811.37, 1,216.14 and 399.63 is: 599.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.37 : 1,216.14 = 399.63 : x
  2. Step 2: Convert to fraction form
    811.37/1,216.14 = 399.63/x
  3. Step 3: Cross multiply
    811.37x = 1,216.14 × 399.63
  4. Step 4: Simplify right side
    811.37x = 486,004.03
  5. Step 5: Solve for x
    x = 486,004.03/811.37
  6. Step 6: Final answer
    x = 599.00

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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.