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Finding the Fourth Proportional to 72,857.11, 109,220.83 and 28,473.77

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Solution

The fourth proportional to 72,857.11, 109,220.83 and 28,473.77 is: 42,685.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,857.11 : 109,220.83 = 28,473.77 : x
  2. Step 2: Convert to fraction form
    72,857.11/109,220.83 = 28,473.77/x
  3. Step 3: Cross multiply
    72,857.11x = 109,220.83 × 28,473.77
  4. Step 4: Simplify right side
    72,857.11x = 3,109,928,792.63
  5. Step 5: Solve for x
    x = 3,109,928,792.63/72,857.11
  6. Step 6: Final answer
    x = 42,685.32

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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.