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Finding the Fourth Proportional to 43,138.72, 64,662 and 30,789.28

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Solution

The fourth proportional to 43,138.72, 64,662 and 30,789.28 is: 46,151.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,138.72 : 64,662 = 30,789.28 : x
  2. Step 2: Convert to fraction form
    43,138.72/64,662 = 30,789.28/x
  3. Step 3: Cross multiply
    43,138.72x = 64,662 × 30,789.28
  4. Step 4: Simplify right side
    43,138.72x = 1,990,896,423.36
  5. Step 5: Solve for x
    x = 1,990,896,423.36/43,138.72
  6. Step 6: Final answer
    x = 46,151.03

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