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Finding the Fourth Proportional to 664,206.40, 996,309.60 and 309,912.40

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Solution

The fourth proportional to 664,206.40, 996,309.60 and 309,912.40 is: 464,868.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,206.40 : 996,309.60 = 309,912.40 : x
  2. Step 2: Convert to fraction form
    664,206.40/996,309.60 = 309,912.40/x
  3. Step 3: Cross multiply
    664,206.40x = 996,309.60 × 309,912.40
  4. Step 4: Simplify right side
    664,206.40x = 308,768,699,279.04
  5. Step 5: Solve for x
    x = 308,768,699,279.04/664,206.40
  6. Step 6: Final answer
    x = 464,868.60

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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.