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Finding the Fourth Proportional to 280,109.60, 420,164.40 and 80,412.20

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Solution

The fourth proportional to 280,109.60, 420,164.40 and 80,412.20 is: 120,618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,109.60 : 420,164.40 = 80,412.20 : x
  2. Step 2: Convert to fraction form
    280,109.60/420,164.40 = 80,412.20/x
  3. Step 3: Cross multiply
    280,109.60x = 420,164.40 × 80,412.20
  4. Step 4: Simplify right side
    280,109.60x = 33,786,343,765.68
  5. Step 5: Solve for x
    x = 33,786,343,765.68/280,109.60
  6. Step 6: Final answer
    x = 120,618.30

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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.