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Finding the Fourth Proportional to 579,404.80, 869,107.20 and 420,889.60

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Solution

The fourth proportional to 579,404.80, 869,107.20 and 420,889.60 is: 631,334.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,404.80 : 869,107.20 = 420,889.60 : x
  2. Step 2: Convert to fraction form
    579,404.80/869,107.20 = 420,889.60/x
  3. Step 3: Cross multiply
    579,404.80x = 869,107.20 × 420,889.60
  4. Step 4: Simplify right side
    579,404.80x = 365,798,181,765.12
  5. Step 5: Solve for x
    x = 365,798,181,765.12/579,404.80
  6. Step 6: Final answer
    x = 631,334.40

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Half scale
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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.