Home / 820,109.20-1,230,358.20-420,811.60

Finding the Fourth Proportional to 820,109.20, 1,230,358.20 and 420,811.60

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Solution

The fourth proportional to 820,109.20, 1,230,358.20 and 420,811.60 is: 631,317.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,109.20 : 1,230,358.20 = 420,811.60 : x
  2. Step 2: Convert to fraction form
    820,109.20/1,230,358.20 = 420,811.60/x
  3. Step 3: Cross multiply
    820,109.20x = 1,230,358.20 × 420,811.60
  4. Step 4: Simplify right side
    820,109.20x = 517,749,002,715.12
  5. Step 5: Solve for x
    x = 517,749,002,715.12/820,109.20
  6. Step 6: Final answer
    x = 631,317.15

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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.