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Finding the Fourth Proportional to 539,985.20, 809,459.40 and 419,975.60

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Solution

The fourth proportional to 539,985.20, 809,459.40 and 419,975.60 is: 629,560.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,985.20 : 809,459.40 = 419,975.60 : x
  2. Step 2: Convert to fraction form
    539,985.20/809,459.40 = 419,975.60/x
  3. Step 3: Cross multiply
    539,985.20x = 809,459.40 × 419,975.60
  4. Step 4: Simplify right side
    539,985.20x = 339,953,197,190.64
  5. Step 5: Solve for x
    x = 339,953,197,190.64/539,985.20
  6. Step 6: Final answer
    x = 629,560.21

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Double scale
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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.