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Finding the Fourth Proportional to 81,497.80, 122,246.70 and 80,979.40

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Solution

The fourth proportional to 81,497.80, 122,246.70 and 80,979.40 is: 121,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,497.80 : 122,246.70 = 80,979.40 : x
  2. Step 2: Convert to fraction form
    81,497.80/122,246.70 = 80,979.40/x
  3. Step 3: Cross multiply
    81,497.80x = 122,246.70 × 80,979.40
  4. Step 4: Simplify right side
    81,497.80x = 9,899,464,417.98
  5. Step 5: Solve for x
    x = 9,899,464,417.98/81,497.80
  6. Step 6: Final answer
    x = 121,469.10

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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.