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Finding the Fourth Proportional to 645,308.70, 967,963.05 and 393,366.30

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Solution

The fourth proportional to 645,308.70, 967,963.05 and 393,366.30 is: 590,049.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,308.70 : 967,963.05 = 393,366.30 : x
  2. Step 2: Convert to fraction form
    645,308.70/967,963.05 = 393,366.30/x
  3. Step 3: Cross multiply
    645,308.70x = 967,963.05 × 393,366.30
  4. Step 4: Simplify right side
    645,308.70x = 380,764,043,515.22
  5. Step 5: Solve for x
    x = 380,764,043,515.22/645,308.70
  6. Step 6: Final answer
    x = 590,049.45

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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.