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Finding the Fourth Proportional to 72,855.11, 109,217.83 and 28,471.77

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Solution

The fourth proportional to 72,855.11, 109,217.83 and 28,471.77 is: 42,682.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,855.11 : 109,217.83 = 28,471.77 : x
  2. Step 2: Convert to fraction form
    72,855.11/109,217.83 = 28,471.77/x
  3. Step 3: Cross multiply
    72,855.11x = 109,217.83 × 28,471.77
  4. Step 4: Simplify right side
    72,855.11x = 3,109,624,935.66
  5. Step 5: Solve for x
    x = 3,109,624,935.66/72,855.11
  6. Step 6: Final answer
    x = 42,682.32

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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.