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Finding the Fourth Proportional to 86,738.60, 130,107.90 and 81,489.80

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Solution

The fourth proportional to 86,738.60, 130,107.90 and 81,489.80 is: 122,234.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,738.60 : 130,107.90 = 81,489.80 : x
  2. Step 2: Convert to fraction form
    86,738.60/130,107.90 = 81,489.80/x
  3. Step 3: Cross multiply
    86,738.60x = 130,107.90 × 81,489.80
  4. Step 4: Simplify right side
    86,738.60x = 10,602,466,749.42
  5. Step 5: Solve for x
    x = 10,602,466,749.42/86,738.60
  6. Step 6: Final answer
    x = 122,234.70

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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.