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Finding the Fourth Proportional to 86,620.42, 129,942.94 and 26,653.87

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Solution

The fourth proportional to 86,620.42, 129,942.94 and 26,653.87 is: 39,984.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,620.42 : 129,942.94 = 26,653.87 : x
  2. Step 2: Convert to fraction form
    86,620.42/129,942.94 = 26,653.87/x
  3. Step 3: Cross multiply
    86,620.42x = 129,942.94 × 26,653.87
  4. Step 4: Simplify right side
    86,620.42x = 3,463,481,772.05
  5. Step 5: Solve for x
    x = 3,463,481,772.05/86,620.42
  6. Step 6: Final answer
    x = 39,984.59

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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.