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Finding the Fourth Proportional to 72,651.90, 108,977.60 and 19,343.88

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Solution

The fourth proportional to 72,651.90, 108,977.60 and 19,343.88 is: 29,015.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,651.90 : 108,977.60 = 19,343.88 : x
  2. Step 2: Convert to fraction form
    72,651.90/108,977.60 = 19,343.88/x
  3. Step 3: Cross multiply
    72,651.90x = 108,977.60 × 19,343.88
  4. Step 4: Simplify right side
    72,651.90x = 2,108,049,617.09
  5. Step 5: Solve for x
    x = 2,108,049,617.09/72,651.90
  6. Step 6: Final answer
    x = 29,015.75

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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.