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Finding the Fourth Proportional to 886.52, 1,329.26 and 399.09

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Solution

The fourth proportional to 886.52, 1,329.26 and 399.09 is: 598.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.52 : 1,329.26 = 399.09 : x
  2. Step 2: Convert to fraction form
    886.52/1,329.26 = 399.09/x
  3. Step 3: Cross multiply
    886.52x = 1,329.26 × 399.09
  4. Step 4: Simplify right side
    886.52x = 530,492.38
  5. Step 5: Solve for x
    x = 530,492.38/886.52
  6. Step 6: Final answer
    x = 598.40

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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.