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Finding the Fourth Proportional to 128,860.88, 177,905.77 and 84,226.64

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Solution

The fourth proportional to 128,860.88, 177,905.77 and 84,226.64 is: 116,283.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,860.88 : 177,905.77 = 84,226.64 : x
  2. Step 2: Convert to fraction form
    128,860.88/177,905.77 = 84,226.64/x
  3. Step 3: Cross multiply
    128,860.88x = 177,905.77 × 84,226.64
  4. Step 4: Simplify right side
    128,860.88x = 14,984,404,143.62
  5. Step 5: Solve for x
    x = 14,984,404,143.62/128,860.88
  6. Step 6: Final answer
    x = 116,283.58

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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.