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Finding the Fourth Proportional to 79,999.20, 119,998.80 and 78,271.20

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Solution

The fourth proportional to 79,999.20, 119,998.80 and 78,271.20 is: 117,406.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,999.20 : 119,998.80 = 78,271.20 : x
  2. Step 2: Convert to fraction form
    79,999.20/119,998.80 = 78,271.20/x
  3. Step 3: Cross multiply
    79,999.20x = 119,998.80 × 78,271.20
  4. Step 4: Simplify right side
    79,999.20x = 9,392,450,074.56
  5. Step 5: Solve for x
    x = 9,392,450,074.56/79,999.20
  6. Step 6: Final answer
    x = 117,406.80

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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.