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Finding the Fourth Proportional to 68,129.72, 102,209.94 and 20,749.04

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Solution

The fourth proportional to 68,129.72, 102,209.94 and 20,749.04 is: 31,128.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,129.72 : 102,209.94 = 20,749.04 : x
  2. Step 2: Convert to fraction form
    68,129.72/102,209.94 = 20,749.04/x
  3. Step 3: Cross multiply
    68,129.72x = 102,209.94 × 20,749.04
  4. Step 4: Simplify right side
    68,129.72x = 2,120,758,133.46
  5. Step 5: Solve for x
    x = 2,120,758,133.46/68,129.72
  6. Step 6: Final answer
    x = 31,128.24

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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.