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Finding the Fourth Proportional to 676.53, 937.91 and 641.40

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Solution

The fourth proportional to 676.53, 937.91 and 641.40 is: 889.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.53 : 937.91 = 641.40 : x
  2. Step 2: Convert to fraction form
    676.53/937.91 = 641.40/x
  3. Step 3: Cross multiply
    676.53x = 937.91 × 641.40
  4. Step 4: Simplify right side
    676.53x = 601,577.08
  5. Step 5: Solve for x
    x = 601,577.08/676.53
  6. Step 6: Final answer
    x = 889.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.