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Finding the Fourth Proportional to 885.11, 1,221.53 and 492.21

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Solution

The fourth proportional to 885.11, 1,221.53 and 492.21 is: 679.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.11 : 1,221.53 = 492.21 : x
  2. Step 2: Convert to fraction form
    885.11/1,221.53 = 492.21/x
  3. Step 3: Cross multiply
    885.11x = 1,221.53 × 492.21
  4. Step 4: Simplify right side
    885.11x = 601,249.28
  5. Step 5: Solve for x
    x = 601,249.28/885.11
  6. Step 6: Final answer
    x = 679.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.