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Finding the Fourth Proportional to 886.42, 1,329.98 and 399.36

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Solution

The fourth proportional to 886.42, 1,329.98 and 399.36 is: 599.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.42 : 1,329.98 = 399.36 : x
  2. Step 2: Convert to fraction form
    886.42/1,329.98 = 399.36/x
  3. Step 3: Cross multiply
    886.42x = 1,329.98 × 399.36
  4. Step 4: Simplify right side
    886.42x = 531,140.81
  5. Step 5: Solve for x
    x = 531,140.81/886.42
  6. Step 6: Final answer
    x = 599.20

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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.