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Finding the Fourth Proportional to 128,864.81, 177,839.54 and 80,495.39

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Solution

The fourth proportional to 128,864.81, 177,839.54 and 80,495.39 is: 111,087.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,864.81 : 177,839.54 = 80,495.39 : x
  2. Step 2: Convert to fraction form
    128,864.81/177,839.54 = 80,495.39/x
  3. Step 3: Cross multiply
    128,864.81x = 177,839.54 × 80,495.39
  4. Step 4: Simplify right side
    128,864.81x = 14,315,263,129.72
  5. Step 5: Solve for x
    x = 14,315,263,129.72/128,864.81
  6. Step 6: Final answer
    x = 111,087.45

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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.