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Finding the Fourth Proportional to 636,429.71, 878,304.56 and 394,790.13

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Solution

The fourth proportional to 636,429.71, 878,304.56 and 394,790.13 is: 544,829.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,429.71 : 878,304.56 = 394,790.13 : x
  2. Step 2: Convert to fraction form
    636,429.71/878,304.56 = 394,790.13/x
  3. Step 3: Cross multiply
    636,429.71x = 878,304.56 × 394,790.13
  4. Step 4: Simplify right side
    636,429.71x = 346,745,969,448.04
  5. Step 5: Solve for x
    x = 346,745,969,448.04/636,429.71
  6. Step 6: Final answer
    x = 544,829.96

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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.