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Finding the Fourth Proportional to 636,428.43, 878,302.76 and 394,788.86

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Solution

The fourth proportional to 636,428.43, 878,302.76 and 394,788.86 is: 544,828.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,428.43 : 878,302.76 = 394,788.86 : x
  2. Step 2: Convert to fraction form
    636,428.43/878,302.76 = 394,788.86/x
  3. Step 3: Cross multiply
    636,428.43x = 878,302.76 × 394,788.86
  4. Step 4: Simplify right side
    636,428.43x = 346,744,145,355.25
  5. Step 5: Solve for x
    x = 346,744,145,355.25/636,428.43
  6. Step 6: Final answer
    x = 544,828.18

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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.