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Finding the Fourth Proportional to 128,060.60, 191,975.70 and 81,289.40

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Solution

The fourth proportional to 128,060.60, 191,975.70 and 81,289.40 is: 121,860.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,060.60 : 191,975.70 = 81,289.40 : x
  2. Step 2: Convert to fraction form
    128,060.60/191,975.70 = 81,289.40/x
  3. Step 3: Cross multiply
    128,060.60x = 191,975.70 × 81,289.40
  4. Step 4: Simplify right side
    128,060.60x = 15,605,589,467.58
  5. Step 5: Solve for x
    x = 15,605,589,467.58/128,060.60
  6. Step 6: Final answer
    x = 121,860.97

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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.