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Finding the Fourth Proportional to 57,991.20, 86,986.80 and 39,559.20

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Solution

The fourth proportional to 57,991.20, 86,986.80 and 39,559.20 is: 59,338.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,991.20 : 86,986.80 = 39,559.20 : x
  2. Step 2: Convert to fraction form
    57,991.20/86,986.80 = 39,559.20/x
  3. Step 3: Cross multiply
    57,991.20x = 86,986.80 × 39,559.20
  4. Step 4: Simplify right side
    57,991.20x = 3,441,128,218.56
  5. Step 5: Solve for x
    x = 3,441,128,218.56/57,991.20
  6. Step 6: Final answer
    x = 59,338.80

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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.