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Finding the Fourth Proportional to 422,639.28, 634,057.20 and 123,151.68

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Solution

The fourth proportional to 422,639.28, 634,057.20 and 123,151.68 is: 184,756.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,639.28 : 634,057.20 = 123,151.68 : x
  2. Step 2: Convert to fraction form
    422,639.28/634,057.20 = 123,151.68/x
  3. Step 3: Cross multiply
    422,639.28x = 634,057.20 × 123,151.68
  4. Step 4: Simplify right side
    422,639.28x = 78,085,209,396.10
  5. Step 5: Solve for x
    x = 78,085,209,396.10/422,639.28
  6. Step 6: Final answer
    x = 184,756.16

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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.