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Finding the Fourth Proportional to 519,699.40, 780,205.20 and 280,004.20

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Solution

The fourth proportional to 519,699.40, 780,205.20 and 280,004.20 is: 420,359.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,699.40 : 780,205.20 = 280,004.20 : x
  2. Step 2: Convert to fraction form
    519,699.40/780,205.20 = 280,004.20/x
  3. Step 3: Cross multiply
    519,699.40x = 780,205.20 × 280,004.20
  4. Step 4: Simplify right side
    519,699.40x = 218,460,732,861.84
  5. Step 5: Solve for x
    x = 218,460,732,861.84/519,699.40
  6. Step 6: Final answer
    x = 420,359.79

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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.