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Finding the Fourth Proportional to 128,010.80, 192,016.20 and 72,714.80

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Solution

The fourth proportional to 128,010.80, 192,016.20 and 72,714.80 is: 109,072.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,010.80 : 192,016.20 = 72,714.80 : x
  2. Step 2: Convert to fraction form
    128,010.80/192,016.20 = 72,714.80/x
  3. Step 3: Cross multiply
    128,010.80x = 192,016.20 × 72,714.80
  4. Step 4: Simplify right side
    128,010.80x = 13,962,419,579.76
  5. Step 5: Solve for x
    x = 13,962,419,579.76/128,010.80
  6. Step 6: Final answer
    x = 109,072.20

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1.5x scale

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.