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Finding the Fourth Proportional to 643,909.70, 965,864.55 and 405,964.10

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Solution

The fourth proportional to 643,909.70, 965,864.55 and 405,964.10 is: 608,946.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,909.70 : 965,864.55 = 405,964.10 : x
  2. Step 2: Convert to fraction form
    643,909.70/965,864.55 = 405,964.10/x
  3. Step 3: Cross multiply
    643,909.70x = 965,864.55 × 405,964.10
  4. Step 4: Simplify right side
    643,909.70x = 392,106,332,762.66
  5. Step 5: Solve for x
    x = 392,106,332,762.66/643,909.70
  6. Step 6: Final answer
    x = 608,946.15

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Similar ratio
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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.