Home / 128,905.07-177,921.70-88,085.72

Finding the Fourth Proportional to 128,905.07, 177,921.70 and 88,085.72

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Solution

The fourth proportional to 128,905.07, 177,921.70 and 88,085.72 is: 121,580.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,905.07 : 177,921.70 = 88,085.72 : x
  2. Step 2: Convert to fraction form
    128,905.07/177,921.70 = 88,085.72/x
  3. Step 3: Cross multiply
    128,905.07x = 177,921.70 × 88,085.72
  4. Step 4: Simplify right side
    128,905.07x = 15,672,361,414.80
  5. Step 5: Solve for x
    x = 15,672,361,414.80/128,905.07
  6. Step 6: Final answer
    x = 121,580.64

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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.