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Finding the Fourth Proportional to 884.40, 1,220.61 and 636.54

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Solution

The fourth proportional to 884.40, 1,220.61 and 636.54 is: 878.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.40 : 1,220.61 = 636.54 : x
  2. Step 2: Convert to fraction form
    884.40/1,220.61 = 636.54/x
  3. Step 3: Cross multiply
    884.40x = 1,220.61 × 636.54
  4. Step 4: Simplify right side
    884.40x = 776,970.14
  5. Step 5: Solve for x
    x = 776,970.14/884.40
  6. Step 6: Final answer
    x = 878.53

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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.