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Finding the Fourth Proportional to 420,415.20, 630,622.80 and 325,936.80

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Solution

The fourth proportional to 420,415.20, 630,622.80 and 325,936.80 is: 488,905.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,415.20 : 630,622.80 = 325,936.80 : x
  2. Step 2: Convert to fraction form
    420,415.20/630,622.80 = 325,936.80/x
  3. Step 3: Cross multiply
    420,415.20x = 630,622.80 × 325,936.80
  4. Step 4: Simplify right side
    420,415.20x = 205,543,177,439.04
  5. Step 5: Solve for x
    x = 205,543,177,439.04/420,415.20
  6. Step 6: Final answer
    x = 488,905.20

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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.