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Finding the Fourth Proportional to 86,072.88, 128,869.84 and 43,861.96

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Solution

The fourth proportional to 86,072.88, 128,869.84 and 43,861.96 is: 65,670.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,072.88 : 128,869.84 = 43,861.96 : x
  2. Step 2: Convert to fraction form
    86,072.88/128,869.84 = 43,861.96/x
  3. Step 3: Cross multiply
    86,072.88x = 128,869.84 × 43,861.96
  4. Step 4: Simplify right side
    86,072.88x = 5,652,483,767.29
  5. Step 5: Solve for x
    x = 5,652,483,767.29/86,072.88
  6. Step 6: Final answer
    x = 65,670.90

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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.