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Finding the Fourth Proportional to 81,411.60, 122,117.40 and 75,709.20

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Solution

The fourth proportional to 81,411.60, 122,117.40 and 75,709.20 is: 113,563.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,411.60 : 122,117.40 = 75,709.20 : x
  2. Step 2: Convert to fraction form
    81,411.60/122,117.40 = 75,709.20/x
  3. Step 3: Cross multiply
    81,411.60x = 122,117.40 × 75,709.20
  4. Step 4: Simplify right side
    81,411.60x = 9,245,410,660.08
  5. Step 5: Solve for x
    x = 9,245,410,660.08/81,411.60
  6. Step 6: Final answer
    x = 113,563.80

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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.