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Finding the Fourth Proportional to 636,501.40, 878,786.60 and 395,138.61

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Solution

The fourth proportional to 636,501.40, 878,786.60 and 395,138.61 is: 545,548.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,501.40 : 878,786.60 = 395,138.61 : x
  2. Step 2: Convert to fraction form
    636,501.40/878,786.60 = 395,138.61/x
  3. Step 3: Cross multiply
    636,501.40x = 878,786.60 × 395,138.61
  4. Step 4: Simplify right side
    636,501.40x = 347,242,513,634.93
  5. Step 5: Solve for x
    x = 347,242,513,634.93/636,501.40
  6. Step 6: Final answer
    x = 545,548.71

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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.