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Finding the Fourth Proportional to 1,385,831, 1,912,446.90 and 782,257.88

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Solution

The fourth proportional to 1,385,831, 1,912,446.90 and 782,257.88 is: 1,079,515.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385,831 : 1,912,446.90 = 782,257.88 : x
  2. Step 2: Convert to fraction form
    1,385,831/1,912,446.90 = 782,257.88/x
  3. Step 3: Cross multiply
    1,385,831x = 1,912,446.90 × 782,257.88
  4. Step 4: Simplify right side
    1,385,831x = 1,496,026,657,606.57
  5. Step 5: Solve for x
    x = 1,496,026,657,606.57/1,385,831
  6. Step 6: Final answer
    x = 1,079,515.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.