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Finding the Fourth Proportional to 128,059.60, 191,974.20 and 81,288.40

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Solution

The fourth proportional to 128,059.60, 191,974.20 and 81,288.40 is: 121,859.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,059.60 : 191,974.20 = 81,288.40 : x
  2. Step 2: Convert to fraction form
    128,059.60/191,974.20 = 81,288.40/x
  3. Step 3: Cross multiply
    128,059.60x = 191,974.20 × 81,288.40
  4. Step 4: Simplify right side
    128,059.60x = 15,605,275,559.28
  5. Step 5: Solve for x
    x = 15,605,275,559.28/128,059.60
  6. Step 6: Final answer
    x = 121,859.47

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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.