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Finding the Fourth Proportional to 885.21, 1,328.21 and 365.33

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Solution

The fourth proportional to 885.21, 1,328.21 and 365.33 is: 548.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.21 : 1,328.21 = 365.33 : x
  2. Step 2: Convert to fraction form
    885.21/1,328.21 = 365.33/x
  3. Step 3: Cross multiply
    885.21x = 1,328.21 × 365.33
  4. Step 4: Simplify right side
    885.21x = 485,226.49
  5. Step 5: Solve for x
    x = 485,226.49/885.21
  6. Step 6: Final answer
    x = 548.15

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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.