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Finding the Fourth Proportional to 644,579.40, 965,702.70 and 394,969.80

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Solution

The fourth proportional to 644,579.40, 965,702.70 and 394,969.80 is: 591,739.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,579.40 : 965,702.70 = 394,969.80 : x
  2. Step 2: Convert to fraction form
    644,579.40/965,702.70 = 394,969.80/x
  3. Step 3: Cross multiply
    644,579.40x = 965,702.70 × 394,969.80
  4. Step 4: Simplify right side
    644,579.40x = 381,423,402,278.46
  5. Step 5: Solve for x
    x = 381,423,402,278.46/644,579.40
  6. Step 6: Final answer
    x = 591,739.98

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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.