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Finding the Fourth Proportional to 885.14, 1,221.73 and 553.37

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Solution

The fourth proportional to 885.14, 1,221.73 and 553.37 is: 763.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.14 : 1,221.73 = 553.37 : x
  2. Step 2: Convert to fraction form
    885.14/1,221.73 = 553.37/x
  3. Step 3: Cross multiply
    885.14x = 1,221.73 × 553.37
  4. Step 4: Simplify right side
    885.14x = 676,068.73
  5. Step 5: Solve for x
    x = 676,068.73/885.14
  6. Step 6: Final answer
    x = 763.80

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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.