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Finding the Fourth Proportional to 636,390, 878,195.72 and 349,908.08

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Solution

The fourth proportional to 636,390, 878,195.72 and 349,908.08 is: 482,860.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,390 : 878,195.72 = 349,908.08 : x
  2. Step 2: Convert to fraction form
    636,390/878,195.72 = 349,908.08/x
  3. Step 3: Cross multiply
    636,390x = 878,195.72 × 349,908.08
  4. Step 4: Simplify right side
    636,390x = 307,287,778,249.42
  5. Step 5: Solve for x
    x = 307,287,778,249.42/636,390
  6. Step 6: Final answer
    x = 482,860.79

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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.