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Finding the Fourth Proportional to 643,722.80, 965,584.20 and 345,124.40

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Solution

The fourth proportional to 643,722.80, 965,584.20 and 345,124.40 is: 517,686.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,722.80 : 965,584.20 = 345,124.40 : x
  2. Step 2: Convert to fraction form
    643,722.80/965,584.20 = 345,124.40/x
  3. Step 3: Cross multiply
    643,722.80x = 965,584.20 × 345,124.40
  4. Step 4: Simplify right side
    643,722.80x = 333,246,667,674.48
  5. Step 5: Solve for x
    x = 333,246,667,674.48/643,722.80
  6. Step 6: Final answer
    x = 517,686.60

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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.