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Finding the Fourth Proportional to 57,971.72, 86,920.14 and 18,515.72

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Solution

The fourth proportional to 57,971.72, 86,920.14 and 18,515.72 is: 27,761.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,971.72 : 86,920.14 = 18,515.72 : x
  2. Step 2: Convert to fraction form
    57,971.72/86,920.14 = 18,515.72/x
  3. Step 3: Cross multiply
    57,971.72x = 86,920.14 × 18,515.72
  4. Step 4: Simplify right side
    57,971.72x = 1,609,388,974.60
  5. Step 5: Solve for x
    x = 1,609,388,974.60/57,971.72
  6. Step 6: Final answer
    x = 27,761.62

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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.