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Finding the Fourth Proportional to 86,990.37, 130,321.89 and 68,213.40

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Solution

The fourth proportional to 86,990.37, 130,321.89 and 68,213.40 is: 102,191.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,990.37 : 130,321.89 = 68,213.40 : x
  2. Step 2: Convert to fraction form
    86,990.37/130,321.89 = 68,213.40/x
  3. Step 3: Cross multiply
    86,990.37x = 130,321.89 × 68,213.40
  4. Step 4: Simplify right side
    86,990.37x = 8,889,699,211.33
  5. Step 5: Solve for x
    x = 8,889,699,211.33/86,990.37
  6. Step 6: Final answer
    x = 102,191.76

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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.