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Finding the Fourth Proportional to 321,316.37, 479,101.89 and 312,488.43

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Solution

The fourth proportional to 321,316.37, 479,101.89 and 312,488.43 is: 465,938.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,316.37 : 479,101.89 = 312,488.43 : x
  2. Step 2: Convert to fraction form
    321,316.37/479,101.89 = 312,488.43/x
  3. Step 3: Cross multiply
    321,316.37x = 479,101.89 × 312,488.43
  4. Step 4: Simplify right side
    321,316.37x = 149,713,796,791.33
  5. Step 5: Solve for x
    x = 149,713,796,791.33/321,316.37
  6. Step 6: Final answer
    x = 465,938.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.