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Finding the Fourth Proportional to 57,874.71, 86,812.79 and 20,408.51

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Solution

The fourth proportional to 57,874.71, 86,812.79 and 20,408.51 is: 30,613.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,874.71 : 86,812.79 = 20,408.51 : x
  2. Step 2: Convert to fraction form
    57,874.71/86,812.79 = 20,408.51/x
  3. Step 3: Cross multiply
    57,874.71x = 86,812.79 × 20,408.51
  4. Step 4: Simplify right side
    57,874.71x = 1,771,719,309.80
  5. Step 5: Solve for x
    x = 1,771,719,309.80/57,874.71
  6. Step 6: Final answer
    x = 30,613.01

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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.