Home / 820,380.80-1,229,649.60-420,867.20

Finding the Fourth Proportional to 820,380.80, 1,229,649.60 and 420,867.20

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Solution

The fourth proportional to 820,380.80, 1,229,649.60 and 420,867.20 is: 630,828.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,380.80 : 1,229,649.60 = 420,867.20 : x
  2. Step 2: Convert to fraction form
    820,380.80/1,229,649.60 = 420,867.20/x
  3. Step 3: Cross multiply
    820,380.80x = 1,229,649.60 × 420,867.20
  4. Step 4: Simplify right side
    820,380.80x = 517,519,184,133.12
  5. Step 5: Solve for x
    x = 517,519,184,133.12/820,380.80
  6. Step 6: Final answer
    x = 630,828.01

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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.