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Finding the Fourth Proportional to 85,170.72, 127,869.12 and 72,770.43

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Solution

The fourth proportional to 85,170.72, 127,869.12 and 72,770.43 is: 109,252.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,170.72 : 127,869.12 = 72,770.43 : x
  2. Step 2: Convert to fraction form
    85,170.72/127,869.12 = 72,770.43/x
  3. Step 3: Cross multiply
    85,170.72x = 127,869.12 × 72,770.43
  4. Step 4: Simplify right side
    85,170.72x = 9,305,090,846.12
  5. Step 5: Solve for x
    x = 9,305,090,846.12/85,170.72
  6. Step 6: Final answer
    x = 109,252.23

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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.