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Finding the Fourth Proportional to 57,408.21, 86,117.27 and 15,855.21

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Solution

The fourth proportional to 57,408.21, 86,117.27 and 15,855.21 is: 23,784.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,408.21 : 86,117.27 = 15,855.21 : x
  2. Step 2: Convert to fraction form
    57,408.21/86,117.27 = 15,855.21/x
  3. Step 3: Cross multiply
    57,408.21x = 86,117.27 × 15,855.21
  4. Step 4: Simplify right side
    57,408.21x = 1,365,407,321.20
  5. Step 5: Solve for x
    x = 1,365,407,321.20/57,408.21
  6. Step 6: Final answer
    x = 23,784.18

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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.