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Finding the Fourth Proportional to 886.58, 1,329.53 and 399.30

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Solution

The fourth proportional to 886.58, 1,329.53 and 399.30 is: 598.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.58 : 1,329.53 = 399.30 : x
  2. Step 2: Convert to fraction form
    886.58/1,329.53 = 399.30/x
  3. Step 3: Cross multiply
    886.58x = 1,329.53 × 399.30
  4. Step 4: Simplify right side
    886.58x = 530,879.33
  5. Step 5: Solve for x
    x = 530,879.33/886.58
  6. Step 6: Final answer
    x = 598.80

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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.