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Finding the Fourth Proportional to 885.17, 1,221.96 and 553.78

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Solution

The fourth proportional to 885.17, 1,221.96 and 553.78 is: 764.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.17 : 1,221.96 = 553.78 : x
  2. Step 2: Convert to fraction form
    885.17/1,221.96 = 553.78/x
  3. Step 3: Cross multiply
    885.17x = 1,221.96 × 553.78
  4. Step 4: Simplify right side
    885.17x = 676,690.90
  5. Step 5: Solve for x
    x = 676,690.90/885.17
  6. Step 6: Final answer
    x = 764.48

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