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Finding the Fourth Proportional to 644,018.60, 965,643.90 and 394,879.40

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Solution

The fourth proportional to 644,018.60, 965,643.90 and 394,879.40 is: 592,083.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,018.60 : 965,643.90 = 394,879.40 : x
  2. Step 2: Convert to fraction form
    644,018.60/965,643.90 = 394,879.40/x
  3. Step 3: Cross multiply
    644,018.60x = 965,643.90 × 394,879.40
  4. Step 4: Simplify right side
    644,018.60x = 381,312,883,845.66
  5. Step 5: Solve for x
    x = 381,312,883,845.66/644,018.60
  6. Step 6: Final answer
    x = 592,083.65

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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.