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Finding the Fourth Proportional to 62,989.40, 86,922.09 and 39,115.56

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Solution

The fourth proportional to 62,989.40, 86,922.09 and 39,115.56 is: 53,977.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,989.40 : 86,922.09 = 39,115.56 : x
  2. Step 2: Convert to fraction form
    62,989.40/86,922.09 = 39,115.56/x
  3. Step 3: Cross multiply
    62,989.40x = 86,922.09 × 39,115.56
  4. Step 4: Simplify right side
    62,989.40x = 3,400,005,953.73
  5. Step 5: Solve for x
    x = 3,400,005,953.73/62,989.40
  6. Step 6: Final answer
    x = 53,977.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.