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Finding the Fourth Proportional to 126,921.60, 189,993.60 and 112,924.80

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Solution

The fourth proportional to 126,921.60, 189,993.60 and 112,924.80 is: 169,041.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,921.60 : 189,993.60 = 112,924.80 : x
  2. Step 2: Convert to fraction form
    126,921.60/189,993.60 = 112,924.80/x
  3. Step 3: Cross multiply
    126,921.60x = 189,993.60 × 112,924.80
  4. Step 4: Simplify right side
    126,921.60x = 21,454,989,281.28
  5. Step 5: Solve for x
    x = 21,454,989,281.28/126,921.60
  6. Step 6: Final answer
    x = 169,041.28

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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.