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Finding the Fourth Proportional to 889.09, 1,227.56 and 640.49

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Solution

The fourth proportional to 889.09, 1,227.56 and 640.49 is: 884.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.09 : 1,227.56 = 640.49 : x
  2. Step 2: Convert to fraction form
    889.09/1,227.56 = 640.49/x
  3. Step 3: Cross multiply
    889.09x = 1,227.56 × 640.49
  4. Step 4: Simplify right side
    889.09x = 786,235.37
  5. Step 5: Solve for x
    x = 786,235.37/889.09
  6. Step 6: Final answer
    x = 884.32

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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.