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Finding the Fourth Proportional to 57,868.91, 86,810.31 and 20,421.25

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Solution

The fourth proportional to 57,868.91, 86,810.31 and 20,421.25 is: 30,634.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,868.91 : 86,810.31 = 20,421.25 : x
  2. Step 2: Convert to fraction form
    57,868.91/86,810.31 = 20,421.25/x
  3. Step 3: Cross multiply
    57,868.91x = 86,810.31 × 20,421.25
  4. Step 4: Simplify right side
    57,868.91x = 1,772,775,043.09
  5. Step 5: Solve for x
    x = 1,772,775,043.09/57,868.91
  6. Step 6: Final answer
    x = 30,634.33

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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.