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Finding the Fourth Proportional to 391,629.60, 586,569.60 and 321,645.60

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Solution

The fourth proportional to 391,629.60, 586,569.60 and 321,645.60 is: 481,749.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,629.60 : 586,569.60 = 321,645.60 : x
  2. Step 2: Convert to fraction form
    391,629.60/586,569.60 = 321,645.60/x
  3. Step 3: Cross multiply
    391,629.60x = 586,569.60 × 321,645.60
  4. Step 4: Simplify right side
    391,629.60x = 188,667,530,933.76
  5. Step 5: Solve for x
    x = 188,667,530,933.76/391,629.60
  6. Step 6: Final answer
    x = 481,749.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.