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Finding the Fourth Proportional to 72,143.40, 108,215.10 and 40,650.60

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Solution

The fourth proportional to 72,143.40, 108,215.10 and 40,650.60 is: 60,975.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,143.40 : 108,215.10 = 40,650.60 : x
  2. Step 2: Convert to fraction form
    72,143.40/108,215.10 = 40,650.60/x
  3. Step 3: Cross multiply
    72,143.40x = 108,215.10 × 40,650.60
  4. Step 4: Simplify right side
    72,143.40x = 4,399,008,744.06
  5. Step 5: Solve for x
    x = 4,399,008,744.06/72,143.40
  6. Step 6: Final answer
    x = 60,975.90

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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.