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Finding the Fourth Proportional to 676.88, 1,010.92 and 639.44

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Solution

The fourth proportional to 676.88, 1,010.92 and 639.44 is: 955.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.88 : 1,010.92 = 639.44 : x
  2. Step 2: Convert to fraction form
    676.88/1,010.92 = 639.44/x
  3. Step 3: Cross multiply
    676.88x = 1,010.92 × 639.44
  4. Step 4: Simplify right side
    676.88x = 646,422.68
  5. Step 5: Solve for x
    x = 646,422.68/676.88
  6. Step 6: Final answer
    x = 955.00

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.