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Finding the Fourth Proportional to 1,144.70, 1,579.70 and 620.75

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Solution

The fourth proportional to 1,144.70, 1,579.70 and 620.75 is: 856.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.70 : 1,579.70 = 620.75 : x
  2. Step 2: Convert to fraction form
    1,144.70/1,579.70 = 620.75/x
  3. Step 3: Cross multiply
    1,144.70x = 1,579.70 × 620.75
  4. Step 4: Simplify right side
    1,144.70x = 980,592.43
  5. Step 5: Solve for x
    x = 980,592.43/1,144.70
  6. Step 6: Final answer
    x = 856.64

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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.