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Finding the Fourth Proportional to 862.09, 1,292.68 and 399.64

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Solution

The fourth proportional to 862.09, 1,292.68 and 399.64 is: 599.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.09 : 1,292.68 = 399.64 : x
  2. Step 2: Convert to fraction form
    862.09/1,292.68 = 399.64/x
  3. Step 3: Cross multiply
    862.09x = 1,292.68 × 399.64
  4. Step 4: Simplify right side
    862.09x = 516,606.64
  5. Step 5: Solve for x
    x = 516,606.64/862.09
  6. Step 6: Final answer
    x = 599.25

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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.