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Finding the Fourth Proportional to 886.71, 1,329.90 and 399.67

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Solution

The fourth proportional to 886.71, 1,329.90 and 399.67 is: 599.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.71 : 1,329.90 = 399.67 : x
  2. Step 2: Convert to fraction form
    886.71/1,329.90 = 399.67/x
  3. Step 3: Cross multiply
    886.71x = 1,329.90 × 399.67
  4. Step 4: Simplify right side
    886.71x = 531,521.13
  5. Step 5: Solve for x
    x = 531,521.13/886.71
  6. Step 6: Final answer
    x = 599.43

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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.