Home / 128,390.56-177,187.20-71,802.34

Finding the Fourth Proportional to 128,390.56, 177,187.20 and 71,802.34

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Solution

The fourth proportional to 128,390.56, 177,187.20 and 71,802.34 is: 99,091.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,390.56 : 177,187.20 = 71,802.34 : x
  2. Step 2: Convert to fraction form
    128,390.56/177,187.20 = 71,802.34/x
  3. Step 3: Cross multiply
    128,390.56x = 177,187.20 × 71,802.34
  4. Step 4: Simplify right side
    128,390.56x = 12,722,455,578.05
  5. Step 5: Solve for x
    x = 12,722,455,578.05/128,390.56
  6. Step 6: Final answer
    x = 99,091.83

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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.