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Finding the Fourth Proportional to 889.28, 1,331.29 and 851.22

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Solution

The fourth proportional to 889.28, 1,331.29 and 851.22 is: 1,274.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.28 : 1,331.29 = 851.22 : x
  2. Step 2: Convert to fraction form
    889.28/1,331.29 = 851.22/x
  3. Step 3: Cross multiply
    889.28x = 1,331.29 × 851.22
  4. Step 4: Simplify right side
    889.28x = 1,133,219.37
  5. Step 5: Solve for x
    x = 1,133,219.37/889.28
  6. Step 6: Final answer
    x = 1,274.31

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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.