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Finding the Fourth Proportional to 57,900.80, 86,858.20 and 20,453.21

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Solution

The fourth proportional to 57,900.80, 86,858.20 and 20,453.21 is: 30,682.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,900.80 : 86,858.20 = 20,453.21 : x
  2. Step 2: Convert to fraction form
    57,900.80/86,858.20 = 20,453.21/x
  3. Step 3: Cross multiply
    57,900.80x = 86,858.20 × 20,453.21
  4. Step 4: Simplify right side
    57,900.80x = 1,776,528,918.66
  5. Step 5: Solve for x
    x = 1,776,528,918.66/57,900.80
  6. Step 6: Final answer
    x = 30,682.29

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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.