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Finding the Fourth Proportional to 636,503.65, 878,789.70 and 395,140.86

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Solution

The fourth proportional to 636,503.65, 878,789.70 and 395,140.86 is: 545,551.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,503.65 : 878,789.70 = 395,140.86 : x
  2. Step 2: Convert to fraction form
    636,503.65/878,789.70 = 395,140.86/x
  3. Step 3: Cross multiply
    636,503.65x = 878,789.70 × 395,140.86
  4. Step 4: Simplify right side
    636,503.65x = 347,245,717,817.14
  5. Step 5: Solve for x
    x = 347,245,717,817.14/636,503.65
  6. Step 6: Final answer
    x = 545,551.81

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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.