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Finding the Fourth Proportional to 889.03, 1,331.72 and 644.82

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Solution

The fourth proportional to 889.03, 1,331.72 and 644.82 is: 965.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.03 : 1,331.72 = 644.82 : x
  2. Step 2: Convert to fraction form
    889.03/1,331.72 = 644.82/x
  3. Step 3: Cross multiply
    889.03x = 1,331.72 × 644.82
  4. Step 4: Simplify right side
    889.03x = 858,719.69
  5. Step 5: Solve for x
    x = 858,719.69/889.03
  6. Step 6: Final answer
    x = 965.91

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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.