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Finding the Fourth Proportional to 129,412.44, 178,622.42 and 100,725.48

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Solution

The fourth proportional to 129,412.44, 178,622.42 and 100,725.48 is: 139,027.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,412.44 : 178,622.42 = 100,725.48 : x
  2. Step 2: Convert to fraction form
    129,412.44/178,622.42 = 100,725.48/x
  3. Step 3: Cross multiply
    129,412.44x = 178,622.42 × 100,725.48
  4. Step 4: Simplify right side
    129,412.44x = 17,991,828,489.63
  5. Step 5: Solve for x
    x = 17,991,828,489.63/129,412.44
  6. Step 6: Final answer
    x = 139,027.04

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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.