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Finding the Fourth Proportional to 72,639.72, 108,965.85 and 20,049.21

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Solution

The fourth proportional to 72,639.72, 108,965.85 and 20,049.21 is: 30,075.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,639.72 : 108,965.85 = 20,049.21 : x
  2. Step 2: Convert to fraction form
    72,639.72/108,965.85 = 20,049.21/x
  3. Step 3: Cross multiply
    72,639.72x = 108,965.85 × 20,049.21
  4. Step 4: Simplify right side
    72,639.72x = 2,184,679,209.48
  5. Step 5: Solve for x
    x = 2,184,679,209.48/72,639.72
  6. Step 6: Final answer
    x = 30,075.55

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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.