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Finding the Fourth Proportional to 1,029.90, 1,422.09 and 676.10

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Solution

The fourth proportional to 1,029.90, 1,422.09 and 676.10 is: 933.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.90 : 1,422.09 = 676.10 : x
  2. Step 2: Convert to fraction form
    1,029.90/1,422.09 = 676.10/x
  3. Step 3: Cross multiply
    1,029.90x = 1,422.09 × 676.10
  4. Step 4: Simplify right side
    1,029.90x = 961,475.05
  5. Step 5: Solve for x
    x = 961,475.05/1,029.90
  6. Step 6: Final answer
    x = 933.56

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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.