Home / 764,520.21-1,055,015.43-420,356.57

Finding the Fourth Proportional to 764,520.21, 1,055,015.43 and 420,356.57

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Solution

The fourth proportional to 764,520.21, 1,055,015.43 and 420,356.57 is: 580,079.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    764,520.21 : 1,055,015.43 = 420,356.57 : x
  2. Step 2: Convert to fraction form
    764,520.21/1,055,015.43 = 420,356.57/x
  3. Step 3: Cross multiply
    764,520.21x = 1,055,015.43 × 420,356.57
  4. Step 4: Simplify right side
    764,520.21x = 443,482,662,176.80
  5. Step 5: Solve for x
    x = 443,482,662,176.80/764,520.21
  6. Step 6: Final answer
    x = 580,079.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.