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Finding the Fourth Proportional to 279,045,910.80, 418,568,866.20 and 84,955,784.40

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Solution

The fourth proportional to 279,045,910.80, 418,568,866.20 and 84,955,784.40 is: 127,433,676.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,045,910.80 : 418,568,866.20 = 84,955,784.40 : x
  2. Step 2: Convert to fraction form
    279,045,910.80/418,568,866.20 = 84,955,784.40/x
  3. Step 3: Cross multiply
    279,045,910.80x = 418,568,866.20 × 84,955,784.40
  4. Step 4: Simplify right side
    279,045,910.80x = 35,559,846,353,439,648
  5. Step 5: Solve for x
    x = 35,559,846,353,439,648/279,045,910.80
  6. Step 6: Final answer
    x = 127,433,676.60

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Similar ratio
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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.