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Finding the Fourth Proportional to 800.31, 1,199.43 and 453.12

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Solution

The fourth proportional to 800.31, 1,199.43 and 453.12 is: 679.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.31 : 1,199.43 = 453.12 : x
  2. Step 2: Convert to fraction form
    800.31/1,199.43 = 453.12/x
  3. Step 3: Cross multiply
    800.31x = 1,199.43 × 453.12
  4. Step 4: Simplify right side
    800.31x = 543,485.87
  5. Step 5: Solve for x
    x = 543,485.87/800.31
  6. Step 6: Final answer
    x = 679.10

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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.