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Finding the Fourth Proportional to 885.96, 1,329.36 and 399.24

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Solution

The fourth proportional to 885.96, 1,329.36 and 399.24 is: 599.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.96 : 1,329.36 = 399.24 : x
  2. Step 2: Convert to fraction form
    885.96/1,329.36 = 399.24/x
  3. Step 3: Cross multiply
    885.96x = 1,329.36 × 399.24
  4. Step 4: Simplify right side
    885.96x = 530,733.69
  5. Step 5: Solve for x
    x = 530,733.69/885.96
  6. Step 6: Final answer
    x = 599.05

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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.