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Finding the Fourth Proportional to 1,144.60, 1,579.82 and 679

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Solution

The fourth proportional to 1,144.60, 1,579.82 and 679 is: 937.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.60 : 1,579.82 = 679 : x
  2. Step 2: Convert to fraction form
    1,144.60/1,579.82 = 679/x
  3. Step 3: Cross multiply
    1,144.60x = 1,579.82 × 679
  4. Step 4: Simplify right side
    1,144.60x = 1,072,697.78
  5. Step 5: Solve for x
    x = 1,072,697.78/1,144.60
  6. Step 6: Final answer
    x = 937.18

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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.