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Finding the Fourth Proportional to 885.28, 1,221.84 and 553.60

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Solution

The fourth proportional to 885.28, 1,221.84 and 553.60 is: 764.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.28 : 1,221.84 = 553.60 : x
  2. Step 2: Convert to fraction form
    885.28/1,221.84 = 553.60/x
  3. Step 3: Cross multiply
    885.28x = 1,221.84 × 553.60
  4. Step 4: Simplify right side
    885.28x = 676,410.62
  5. Step 5: Solve for x
    x = 676,410.62/885.28
  6. Step 6: Final answer
    x = 764.06

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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.