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Finding the Fourth Proportional to 73,173.21, 100,978.70 and 39,639.21

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Solution

The fourth proportional to 73,173.21, 100,978.70 and 39,639.21 is: 54,701.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,173.21 : 100,978.70 = 39,639.21 : x
  2. Step 2: Convert to fraction form
    73,173.21/100,978.70 = 39,639.21/x
  3. Step 3: Cross multiply
    73,173.21x = 100,978.70 × 39,639.21
  4. Step 4: Simplify right side
    73,173.21x = 4,002,715,696.63
  5. Step 5: Solve for x
    x = 4,002,715,696.63/73,173.21
  6. Step 6: Final answer
    x = 54,701.93

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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.