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Finding the Fourth Proportional to 764,487.90, 1,055,004.99 and 420,338.70

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Solution

The fourth proportional to 764,487.90, 1,055,004.99 and 420,338.70 is: 580,073.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    764,487.90 : 1,055,004.99 = 420,338.70 : x
  2. Step 2: Convert to fraction form
    764,487.90/1,055,004.99 = 420,338.70/x
  3. Step 3: Cross multiply
    764,487.90x = 1,055,004.99 × 420,338.70
  4. Step 4: Simplify right side
    764,487.90x = 443,459,425,990.11
  5. Step 5: Solve for x
    x = 443,459,425,990.11/764,487.90
  6. Step 6: Final answer
    x = 580,073.83

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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.