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Finding the Fourth Proportional to 889.33, 1,227.39 and 641.47

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Solution

The fourth proportional to 889.33, 1,227.39 and 641.47 is: 885.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.33 : 1,227.39 = 641.47 : x
  2. Step 2: Convert to fraction form
    889.33/1,227.39 = 641.47/x
  3. Step 3: Cross multiply
    889.33x = 1,227.39 × 641.47
  4. Step 4: Simplify right side
    889.33x = 787,333.86
  5. Step 5: Solve for x
    x = 787,333.86/889.33
  6. Step 6: Final answer
    x = 885.31

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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.