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Finding the Fourth Proportional to 128,693.15, 177,536.48 and 80,972.81

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Solution

The fourth proportional to 128,693.15, 177,536.48 and 80,972.81 is: 111,704.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,693.15 : 177,536.48 = 80,972.81 : x
  2. Step 2: Convert to fraction form
    128,693.15/177,536.48 = 80,972.81/x
  3. Step 3: Cross multiply
    128,693.15x = 177,536.48 × 80,972.81
  4. Step 4: Simplify right side
    128,693.15x = 14,375,628,718.18
  5. Step 5: Solve for x
    x = 14,375,628,718.18/128,693.15
  6. Step 6: Final answer
    x = 111,704.69

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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.