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Finding the Fourth Proportional to 520,039.80, 780,059.70 and 323,431.80

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Solution

The fourth proportional to 520,039.80, 780,059.70 and 323,431.80 is: 485,147.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,039.80 : 780,059.70 = 323,431.80 : x
  2. Step 2: Convert to fraction form
    520,039.80/780,059.70 = 323,431.80/x
  3. Step 3: Cross multiply
    520,039.80x = 780,059.70 × 323,431.80
  4. Step 4: Simplify right side
    520,039.80x = 252,296,112,878.46
  5. Step 5: Solve for x
    x = 252,296,112,878.46/520,039.80
  6. Step 6: Final answer
    x = 485,147.70

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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.