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Finding the Fourth Proportional to 81,965.20, 122,947.80 and 74,966.80

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Solution

The fourth proportional to 81,965.20, 122,947.80 and 74,966.80 is: 112,450.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,965.20 : 122,947.80 = 74,966.80 : x
  2. Step 2: Convert to fraction form
    81,965.20/122,947.80 = 74,966.80/x
  3. Step 3: Cross multiply
    81,965.20x = 122,947.80 × 74,966.80
  4. Step 4: Simplify right side
    81,965.20x = 9,217,003,133.04
  5. Step 5: Solve for x
    x = 9,217,003,133.04/81,965.20
  6. Step 6: Final answer
    x = 112,450.20

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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.