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Finding the Fourth Proportional to 1,144.79, 1,579.80 and 620.81

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Solution

The fourth proportional to 1,144.79, 1,579.80 and 620.81 is: 856.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.79 : 1,579.80 = 620.81 : x
  2. Step 2: Convert to fraction form
    1,144.79/1,579.80 = 620.81/x
  3. Step 3: Cross multiply
    1,144.79x = 1,579.80 × 620.81
  4. Step 4: Simplify right side
    1,144.79x = 980,759.59
  5. Step 5: Solve for x
    x = 980,759.59/1,144.79
  6. Step 6: Final answer
    x = 856.72

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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.