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Finding the Fourth Proportional to 79,810.20, 119,715.30 and 66,979.80

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Solution

The fourth proportional to 79,810.20, 119,715.30 and 66,979.80 is: 100,469.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,810.20 : 119,715.30 = 66,979.80 : x
  2. Step 2: Convert to fraction form
    79,810.20/119,715.30 = 66,979.80/x
  3. Step 3: Cross multiply
    79,810.20x = 119,715.30 × 66,979.80
  4. Step 4: Simplify right side
    79,810.20x = 8,018,506,850.94
  5. Step 5: Solve for x
    x = 8,018,506,850.94/79,810.20
  6. Step 6: Final answer
    x = 100,469.70

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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.