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Finding the Fourth Proportional to 43,587.72, 65,372.97 and 11,989.65

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Solution

The fourth proportional to 43,587.72, 65,372.97 and 11,989.65 is: 17,982.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,587.72 : 65,372.97 = 11,989.65 : x
  2. Step 2: Convert to fraction form
    43,587.72/65,372.97 = 11,989.65/x
  3. Step 3: Cross multiply
    43,587.72x = 65,372.97 × 11,989.65
  4. Step 4: Simplify right side
    43,587.72x = 783,799,319.87
  5. Step 5: Solve for x
    x = 783,799,319.87/43,587.72
  6. Step 6: Final answer
    x = 17,982.11

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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.