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Finding the Fourth Proportional to 885.60, 1,221.75 and 553.91

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Solution

The fourth proportional to 885.60, 1,221.75 and 553.91 is: 764.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.60 : 1,221.75 = 553.91 : x
  2. Step 2: Convert to fraction form
    885.60/1,221.75 = 553.91/x
  3. Step 3: Cross multiply
    885.60x = 1,221.75 × 553.91
  4. Step 4: Simplify right side
    885.60x = 676,733.43
  5. Step 5: Solve for x
    x = 676,733.43/885.60
  6. Step 6: Final answer
    x = 764.15

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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.