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Finding the Fourth Proportional to 885.60, 1,221.39 and 553.41

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Solution

The fourth proportional to 885.60, 1,221.39 and 553.41 is: 763.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.60 : 1,221.39 = 553.41 : x
  2. Step 2: Convert to fraction form
    885.60/1,221.39 = 553.41/x
  3. Step 3: Cross multiply
    885.60x = 1,221.39 × 553.41
  4. Step 4: Simplify right side
    885.60x = 675,929.44
  5. Step 5: Solve for x
    x = 675,929.44/885.60
  6. Step 6: Final answer
    x = 763.24

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Double scale
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1.5x scale

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.