Home / 128,769.68-177,701.60-72,181.06

Finding the Fourth Proportional to 128,769.68, 177,701.60 and 72,181.06

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Solution

The fourth proportional to 128,769.68, 177,701.60 and 72,181.06 is: 99,609.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,769.68 : 177,701.60 = 72,181.06 : x
  2. Step 2: Convert to fraction form
    128,769.68/177,701.60 = 72,181.06/x
  3. Step 3: Cross multiply
    128,769.68x = 177,701.60 × 72,181.06
  4. Step 4: Simplify right side
    128,769.68x = 12,826,689,587.89
  5. Step 5: Solve for x
    x = 12,826,689,587.89/128,769.68
  6. Step 6: Final answer
    x = 99,609.55

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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.