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Finding the Fourth Proportional to 72,635.72, 108,959.85 and 20,045.21

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Solution

The fourth proportional to 72,635.72, 108,959.85 and 20,045.21 is: 30,069.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,635.72 : 108,959.85 = 20,045.21 : x
  2. Step 2: Convert to fraction form
    72,635.72/108,959.85 = 20,045.21/x
  3. Step 3: Cross multiply
    72,635.72x = 108,959.85 × 20,045.21
  4. Step 4: Simplify right side
    72,635.72x = 2,184,122,530.02
  5. Step 5: Solve for x
    x = 2,184,122,530.02/72,635.72
  6. Step 6: Final answer
    x = 30,069.54

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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.