Home / 578,401.20-868,638.60-420,807.60

Finding the Fourth Proportional to 578,401.20, 868,638.60 and 420,807.60

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Solution

The fourth proportional to 578,401.20, 868,638.60 and 420,807.60 is: 631,965.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,401.20 : 868,638.60 = 420,807.60 : x
  2. Step 2: Convert to fraction form
    578,401.20/868,638.60 = 420,807.60/x
  3. Step 3: Cross multiply
    578,401.20x = 868,638.60 × 420,807.60
  4. Step 4: Simplify right side
    578,401.20x = 365,529,724,533.36
  5. Step 5: Solve for x
    x = 365,529,724,533.36/578,401.20
  6. Step 6: Final answer
    x = 631,965.71

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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.