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Finding the Fourth Proportional to 1,008.54, 1,390.50 and 676.44

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Solution

The fourth proportional to 1,008.54, 1,390.50 and 676.44 is: 932.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.54 : 1,390.50 = 676.44 : x
  2. Step 2: Convert to fraction form
    1,008.54/1,390.50 = 676.44/x
  3. Step 3: Cross multiply
    1,008.54x = 1,390.50 × 676.44
  4. Step 4: Simplify right side
    1,008.54x = 940,589.82
  5. Step 5: Solve for x
    x = 940,589.82/1,008.54
  6. Step 6: Final answer
    x = 932.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.