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Finding the Fourth Proportional to 889.71, 1,331.97 and 518.38

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Solution

The fourth proportional to 889.71, 1,331.97 and 518.38 is: 776.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.71 : 1,331.97 = 518.38 : x
  2. Step 2: Convert to fraction form
    889.71/1,331.97 = 518.38/x
  3. Step 3: Cross multiply
    889.71x = 1,331.97 × 518.38
  4. Step 4: Simplify right side
    889.71x = 690,467.48
  5. Step 5: Solve for x
    x = 690,467.48/889.71
  6. Step 6: Final answer
    x = 776.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.