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Finding the Fourth Proportional to 884.78, 1,221.13 and 636.92

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Solution

The fourth proportional to 884.78, 1,221.13 and 636.92 is: 879.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.78 : 1,221.13 = 636.92 : x
  2. Step 2: Convert to fraction form
    884.78/1,221.13 = 636.92/x
  3. Step 3: Cross multiply
    884.78x = 1,221.13 × 636.92
  4. Step 4: Simplify right side
    884.78x = 777,762.12
  5. Step 5: Solve for x
    x = 777,762.12/884.78
  6. Step 6: Final answer
    x = 879.05

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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.