Home / 128,520.06-177,364.47-80,755.74

Finding the Fourth Proportional to 128,520.06, 177,364.47 and 80,755.74

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Solution

The fourth proportional to 128,520.06, 177,364.47 and 80,755.74 is: 111,447.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520.06 : 177,364.47 = 80,755.74 : x
  2. Step 2: Convert to fraction form
    128,520.06/177,364.47 = 80,755.74/x
  3. Step 3: Cross multiply
    128,520.06x = 177,364.47 × 80,755.74
  4. Step 4: Simplify right side
    128,520.06x = 14,323,199,024.56
  5. Step 5: Solve for x
    x = 14,323,199,024.56/128,520.06
  6. Step 6: Final answer
    x = 111,447.19

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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.