Home / 129,638.30-178,983.42-105,821.60

Finding the Fourth Proportional to 129,638.30, 178,983.42 and 105,821.60

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Solution

The fourth proportional to 129,638.30, 178,983.42 and 105,821.60 is: 146,101.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,638.30 : 178,983.42 = 105,821.60 : x
  2. Step 2: Convert to fraction form
    129,638.30/178,983.42 = 105,821.60/x
  3. Step 3: Cross multiply
    129,638.30x = 178,983.42 × 105,821.60
  4. Step 4: Simplify right side
    129,638.30x = 18,940,311,877.87
  5. Step 5: Solve for x
    x = 18,940,311,877.87/129,638.30
  6. Step 6: Final answer
    x = 146,101.21

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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.