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Finding the Fourth Proportional to 643,821.80, 965,732.70 and 475,860.20

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Solution

The fourth proportional to 643,821.80, 965,732.70 and 475,860.20 is: 713,790.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,821.80 : 965,732.70 = 475,860.20 : x
  2. Step 2: Convert to fraction form
    643,821.80/965,732.70 = 475,860.20/x
  3. Step 3: Cross multiply
    643,821.80x = 965,732.70 × 475,860.20
  4. Step 4: Simplify right side
    643,821.80x = 459,553,755,768.54
  5. Step 5: Solve for x
    x = 459,553,755,768.54/643,821.80
  6. Step 6: Final answer
    x = 713,790.30

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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.