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Finding the Fourth Proportional to 643,735.20, 965,602.80 and 394,557.60

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Solution

The fourth proportional to 643,735.20, 965,602.80 and 394,557.60 is: 591,836.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,735.20 : 965,602.80 = 394,557.60 : x
  2. Step 2: Convert to fraction form
    643,735.20/965,602.80 = 394,557.60/x
  3. Step 3: Cross multiply
    643,735.20x = 965,602.80 × 394,557.60
  4. Step 4: Simplify right side
    643,735.20x = 380,985,923,321.28
  5. Step 5: Solve for x
    x = 380,985,923,321.28/643,735.20
  6. Step 6: Final answer
    x = 591,836.40

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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.