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Finding the Fourth Proportional to 128,860.63, 177,905.43 and 84,226.39

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Solution

The fourth proportional to 128,860.63, 177,905.43 and 84,226.39 is: 116,283.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,860.63 : 177,905.43 = 84,226.39 : x
  2. Step 2: Convert to fraction form
    128,860.63/177,905.43 = 84,226.39/x
  3. Step 3: Cross multiply
    128,860.63x = 177,905.43 × 84,226.39
  4. Step 4: Simplify right side
    128,860.63x = 14,984,330,819.64
  5. Step 5: Solve for x
    x = 14,984,330,819.64/128,860.63
  6. Step 6: Final answer
    x = 116,283.24

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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.