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Finding the Fourth Proportional to 272,605.65, 408,992.18 and 139,579.31

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Solution

The fourth proportional to 272,605.65, 408,992.18 and 139,579.31 is: 209,411.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,605.65 : 408,992.18 = 139,579.31 : x
  2. Step 2: Convert to fraction form
    272,605.65/408,992.18 = 139,579.31/x
  3. Step 3: Cross multiply
    272,605.65x = 408,992.18 × 139,579.31
  4. Step 4: Simplify right side
    272,605.65x = 57,086,843,536.94
  5. Step 5: Solve for x
    x = 57,086,843,536.94/272,605.65
  6. Step 6: Final answer
    x = 209,411.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.