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Finding the Fourth Proportional to 128,016.80, 191,780.40 and 68,832.80

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Solution

The fourth proportional to 128,016.80, 191,780.40 and 68,832.80 is: 103,117.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,016.80 : 191,780.40 = 68,832.80 : x
  2. Step 2: Convert to fraction form
    128,016.80/191,780.40 = 68,832.80/x
  3. Step 3: Cross multiply
    128,016.80x = 191,780.40 × 68,832.80
  4. Step 4: Simplify right side
    128,016.80x = 13,200,781,917.12
  5. Step 5: Solve for x
    x = 13,200,781,917.12/128,016.80
  6. Step 6: Final answer
    x = 103,117.57

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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.