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Finding the Fourth Proportional to 86,739.70, 130,121.70 and 36,819.40

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Solution

The fourth proportional to 86,739.70, 130,121.70 and 36,819.40 is: 55,234.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,739.70 : 130,121.70 = 36,819.40 : x
  2. Step 2: Convert to fraction form
    86,739.70/130,121.70 = 36,819.40/x
  3. Step 3: Cross multiply
    86,739.70x = 130,121.70 × 36,819.40
  4. Step 4: Simplify right side
    86,739.70x = 4,791,002,920.98
  5. Step 5: Solve for x
    x = 4,791,002,920.98/86,739.70
  6. Step 6: Final answer
    x = 55,234.26

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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.