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Finding the Fourth Proportional to 884.64, 1,221.36 and 553.52

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Solution

The fourth proportional to 884.64, 1,221.36 and 553.52 is: 764.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.64 : 1,221.36 = 553.52 : x
  2. Step 2: Convert to fraction form
    884.64/1,221.36 = 553.52/x
  3. Step 3: Cross multiply
    884.64x = 1,221.36 × 553.52
  4. Step 4: Simplify right side
    884.64x = 676,047.19
  5. Step 5: Solve for x
    x = 676,047.19/884.64
  6. Step 6: Final answer
    x = 764.21

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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.