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Finding the Fourth Proportional to 889.38, 1,331.44 and 659.28

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Solution

The fourth proportional to 889.38, 1,331.44 and 659.28 is: 986.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.38 : 1,331.44 = 659.28 : x
  2. Step 2: Convert to fraction form
    889.38/1,331.44 = 659.28/x
  3. Step 3: Cross multiply
    889.38x = 1,331.44 × 659.28
  4. Step 4: Simplify right side
    889.38x = 877,791.76
  5. Step 5: Solve for x
    x = 877,791.76/889.38
  6. Step 6: Final answer
    x = 986.97

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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.