Home / 128,325-177,085.26-71,736.78

Finding the Fourth Proportional to 128,325, 177,085.26 and 71,736.78

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Solution

The fourth proportional to 128,325, 177,085.26 and 71,736.78 is: 98,994.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,325 : 177,085.26 = 71,736.78 : x
  2. Step 2: Convert to fraction form
    128,325/177,085.26 = 71,736.78/x
  3. Step 3: Cross multiply
    128,325x = 177,085.26 × 71,736.78
  4. Step 4: Simplify right side
    128,325x = 12,703,526,337.86
  5. Step 5: Solve for x
    x = 12,703,526,337.86/128,325
  6. Step 6: Final answer
    x = 98,994.95

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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.