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Finding the Fourth Proportional to 881.36, 1,217.68 and 620.54

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Solution

The fourth proportional to 881.36, 1,217.68 and 620.54 is: 857.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.36 : 1,217.68 = 620.54 : x
  2. Step 2: Convert to fraction form
    881.36/1,217.68 = 620.54/x
  3. Step 3: Cross multiply
    881.36x = 1,217.68 × 620.54
  4. Step 4: Simplify right side
    881.36x = 755,619.15
  5. Step 5: Solve for x
    x = 755,619.15/881.36
  6. Step 6: Final answer
    x = 857.33

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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.