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Finding the Fourth Proportional to 128,628.80, 192,878.40 and 76,054.40

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Solution

The fourth proportional to 128,628.80, 192,878.40 and 76,054.40 is: 114,043.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,628.80 : 192,878.40 = 76,054.40 : x
  2. Step 2: Convert to fraction form
    128,628.80/192,878.40 = 76,054.40/x
  3. Step 3: Cross multiply
    128,628.80x = 192,878.40 × 76,054.40
  4. Step 4: Simplify right side
    128,628.80x = 14,669,250,984.96
  5. Step 5: Solve for x
    x = 14,669,250,984.96/128,628.80
  6. Step 6: Final answer
    x = 114,043.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.