Home / 128,939.28-177,936.48-71,579.43

Finding the Fourth Proportional to 128,939.28, 177,936.48 and 71,579.43

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Solution

The fourth proportional to 128,939.28, 177,936.48 and 71,579.43 is: 98,779.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,939.28 : 177,936.48 = 71,579.43 : x
  2. Step 2: Convert to fraction form
    128,939.28/177,936.48 = 71,579.43/x
  3. Step 3: Cross multiply
    128,939.28x = 177,936.48 × 71,579.43
  4. Step 4: Simplify right side
    128,939.28x = 12,736,591,814.61
  5. Step 5: Solve for x
    x = 12,736,591,814.61/128,939.28
  6. Step 6: Final answer
    x = 98,779.77

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1.5x scale

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.