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Finding the Fourth Proportional to 328,857.72, 493,338.24 and 139,318.68

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Solution

The fourth proportional to 328,857.72, 493,338.24 and 139,318.68 is: 208,999.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,857.72 : 493,338.24 = 139,318.68 : x
  2. Step 2: Convert to fraction form
    328,857.72/493,338.24 = 139,318.68/x
  3. Step 3: Cross multiply
    328,857.72x = 493,338.24 × 139,318.68
  4. Step 4: Simplify right side
    328,857.72x = 68,731,232,390.32
  5. Step 5: Solve for x
    x = 68,731,232,390.32/328,857.72
  6. Step 6: Final answer
    x = 208,999.91

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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.