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Finding the Fourth Proportional to 889.86, 1,227.36 and 637.22

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Solution

The fourth proportional to 889.86, 1,227.36 and 637.22 is: 878.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.86 : 1,227.36 = 637.22 : x
  2. Step 2: Convert to fraction form
    889.86/1,227.36 = 637.22/x
  3. Step 3: Cross multiply
    889.86x = 1,227.36 × 637.22
  4. Step 4: Simplify right side
    889.86x = 782,092.20
  5. Step 5: Solve for x
    x = 782,092.20/889.86
  6. Step 6: Final answer
    x = 878.89

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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.