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Finding the Fourth Proportional to 889.20, 1,227.09 and 516.25

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Solution

The fourth proportional to 889.20, 1,227.09 and 516.25 is: 712.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.20 : 1,227.09 = 516.25 : x
  2. Step 2: Convert to fraction form
    889.20/1,227.09 = 516.25/x
  3. Step 3: Cross multiply
    889.20x = 1,227.09 × 516.25
  4. Step 4: Simplify right side
    889.20x = 633,485.21
  5. Step 5: Solve for x
    x = 633,485.21/889.20
  6. Step 6: Final answer
    x = 712.42

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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.