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Finding the Fourth Proportional to 676.62, 1,008.90 and 623.43

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Solution

The fourth proportional to 676.62, 1,008.90 and 623.43 is: 929.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.62 : 1,008.90 = 623.43 : x
  2. Step 2: Convert to fraction form
    676.62/1,008.90 = 623.43/x
  3. Step 3: Cross multiply
    676.62x = 1,008.90 × 623.43
  4. Step 4: Simplify right side
    676.62x = 628,978.53
  5. Step 5: Solve for x
    x = 628,978.53/676.62
  6. Step 6: Final answer
    x = 929.59

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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.