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Finding the Fourth Proportional to 889.64, 1,227.52 and 680.05

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Solution

The fourth proportional to 889.64, 1,227.52 and 680.05 is: 938.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.64 : 1,227.52 = 680.05 : x
  2. Step 2: Convert to fraction form
    889.64/1,227.52 = 680.05/x
  3. Step 3: Cross multiply
    889.64x = 1,227.52 × 680.05
  4. Step 4: Simplify right side
    889.64x = 834,774.98
  5. Step 5: Solve for x
    x = 834,774.98/889.64
  6. Step 6: Final answer
    x = 938.33

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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.