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Finding the Fourth Proportional to 40,137.80, 60,243.72 and 20,430.56

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Solution

The fourth proportional to 40,137.80, 60,243.72 and 20,430.56 is: 30,664.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,137.80 : 60,243.72 = 20,430.56 : x
  2. Step 2: Convert to fraction form
    40,137.80/60,243.72 = 20,430.56/x
  3. Step 3: Cross multiply
    40,137.80x = 60,243.72 × 20,430.56
  4. Step 4: Simplify right side
    40,137.80x = 1,230,812,936.08
  5. Step 5: Solve for x
    x = 1,230,812,936.08/40,137.80
  6. Step 6: Final answer
    x = 30,664.68

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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.