Home / 128,708.06-177,616.80-72,119.43

Finding the Fourth Proportional to 128,708.06, 177,616.80 and 72,119.43

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Solution

The fourth proportional to 128,708.06, 177,616.80 and 72,119.43 is: 99,524.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.06 : 177,616.80 = 72,119.43 : x
  2. Step 2: Convert to fraction form
    128,708.06/177,616.80 = 72,119.43/x
  3. Step 3: Cross multiply
    128,708.06x = 177,616.80 × 72,119.43
  4. Step 4: Simplify right side
    128,708.06x = 12,809,622,374.42
  5. Step 5: Solve for x
    x = 12,809,622,374.42/128,708.06
  6. Step 6: Final answer
    x = 99,524.64

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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.