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Finding the Fourth Proportional to 479,178.45, 661,478.81 and 309,495.33

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Solution

The fourth proportional to 479,178.45, 661,478.81 and 309,495.33 is: 427,240.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,178.45 : 661,478.81 = 309,495.33 : x
  2. Step 2: Convert to fraction form
    479,178.45/661,478.81 = 309,495.33/x
  3. Step 3: Cross multiply
    479,178.45x = 661,478.81 × 309,495.33
  4. Step 4: Simplify right side
    479,178.45x = 204,724,601,041.48
  5. Step 5: Solve for x
    x = 204,724,601,041.48/479,178.45
  6. Step 6: Final answer
    x = 427,240.83

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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.