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Finding the Fourth Proportional to 886.29, 1,329.48 and 399.21

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Solution

The fourth proportional to 886.29, 1,329.48 and 399.21 is: 598.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.29 : 1,329.48 = 399.21 : x
  2. Step 2: Convert to fraction form
    886.29/1,329.48 = 399.21/x
  3. Step 3: Cross multiply
    886.29x = 1,329.48 × 399.21
  4. Step 4: Simplify right side
    886.29x = 530,741.71
  5. Step 5: Solve for x
    x = 530,741.71/886.29
  6. Step 6: Final answer
    x = 598.84

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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.