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Finding the Fourth Proportional to 68,139.68, 102,174.96 and 31,172

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Solution

The fourth proportional to 68,139.68, 102,174.96 and 31,172 is: 46,742.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,139.68 : 102,174.96 = 31,172 : x
  2. Step 2: Convert to fraction form
    68,139.68/102,174.96 = 31,172/x
  3. Step 3: Cross multiply
    68,139.68x = 102,174.96 × 31,172
  4. Step 4: Simplify right side
    68,139.68x = 3,184,997,853.12
  5. Step 5: Solve for x
    x = 3,184,997,853.12/68,139.68
  6. Step 6: Final answer
    x = 46,742.19

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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.