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Finding the Fourth Proportional to 884.94, 1,221.26 and 553.11

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Solution

The fourth proportional to 884.94, 1,221.26 and 553.11 is: 763.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.94 : 1,221.26 = 553.11 : x
  2. Step 2: Convert to fraction form
    884.94/1,221.26 = 553.11/x
  3. Step 3: Cross multiply
    884.94x = 1,221.26 × 553.11
  4. Step 4: Simplify right side
    884.94x = 675,488.35
  5. Step 5: Solve for x
    x = 675,488.35/884.94
  6. Step 6: Final answer
    x = 763.32

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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.