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Finding the Fourth Proportional to 128,380.39, 177,161.62 and 71,018.22

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Solution

The fourth proportional to 128,380.39, 177,161.62 and 71,018.22 is: 98,003.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,380.39 : 177,161.62 = 71,018.22 : x
  2. Step 2: Convert to fraction form
    128,380.39/177,161.62 = 71,018.22/x
  3. Step 3: Cross multiply
    128,380.39x = 177,161.62 × 71,018.22
  4. Step 4: Simplify right side
    128,380.39x = 12,581,702,904.72
  5. Step 5: Solve for x
    x = 12,581,702,904.72/128,380.39
  6. Step 6: Final answer
    x = 98,003.31

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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.