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Finding the Fourth Proportional to 643,811.20, 965,716.80 and 404,310.40

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Solution

The fourth proportional to 643,811.20, 965,716.80 and 404,310.40 is: 606,465.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,811.20 : 965,716.80 = 404,310.40 : x
  2. Step 2: Convert to fraction form
    643,811.20/965,716.80 = 404,310.40/x
  3. Step 3: Cross multiply
    643,811.20x = 965,716.80 × 404,310.40
  4. Step 4: Simplify right side
    643,811.20x = 390,449,345,694.72
  5. Step 5: Solve for x
    x = 390,449,345,694.72/643,811.20
  6. Step 6: Final answer
    x = 606,465.60

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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.