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Finding the Fourth Proportional to 68,672.24, 103,009.73 and 45,129.87

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Solution

The fourth proportional to 68,672.24, 103,009.73 and 45,129.87 is: 67,695.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,672.24 : 103,009.73 = 45,129.87 : x
  2. Step 2: Convert to fraction form
    68,672.24/103,009.73 = 45,129.87/x
  3. Step 3: Cross multiply
    68,672.24x = 103,009.73 × 45,129.87
  4. Step 4: Simplify right side
    68,672.24x = 4,648,815,723.64
  5. Step 5: Solve for x
    x = 4,648,815,723.64/68,672.24
  6. Step 6: Final answer
    x = 67,695.71

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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.