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Finding the Fourth Proportional to 509,795.20, 764,692.80 and 438,936.40

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Solution

The fourth proportional to 509,795.20, 764,692.80 and 438,936.40 is: 658,404.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,795.20 : 764,692.80 = 438,936.40 : x
  2. Step 2: Convert to fraction form
    509,795.20/764,692.80 = 438,936.40/x
  3. Step 3: Cross multiply
    509,795.20x = 764,692.80 × 438,936.40
  4. Step 4: Simplify right side
    509,795.20x = 335,651,504,737.92
  5. Step 5: Solve for x
    x = 335,651,504,737.92/509,795.20
  6. Step 6: Final answer
    x = 658,404.60

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Double scale
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Similar ratio
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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.