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Finding the Fourth Proportional to 68,742.80, 103,037.40 and 39,174.80

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Solution

The fourth proportional to 68,742.80, 103,037.40 and 39,174.80 is: 58,718.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,742.80 : 103,037.40 = 39,174.80 : x
  2. Step 2: Convert to fraction form
    68,742.80/103,037.40 = 39,174.80/x
  3. Step 3: Cross multiply
    68,742.80x = 103,037.40 × 39,174.80
  4. Step 4: Simplify right side
    68,742.80x = 4,036,469,537.52
  5. Step 5: Solve for x
    x = 4,036,469,537.52/68,742.80
  6. Step 6: Final answer
    x = 58,718.43

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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.