Home / 128,739.38-177,671.27-72,161.69

Finding the Fourth Proportional to 128,739.38, 177,671.27 and 72,161.69

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Solution

The fourth proportional to 128,739.38, 177,671.27 and 72,161.69 is: 99,589.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,739.38 : 177,671.27 = 72,161.69 : x
  2. Step 2: Convert to fraction form
    128,739.38/177,671.27 = 72,161.69/x
  3. Step 3: Cross multiply
    128,739.38x = 177,671.27 × 72,161.69
  4. Step 4: Simplify right side
    128,739.38x = 12,821,058,399.69
  5. Step 5: Solve for x
    x = 12,821,058,399.69/128,739.38
  6. Step 6: Final answer
    x = 99,589.25

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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.