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Finding the Fourth Proportional to 172,418.12, 258,435.42 and 72,548.84

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Solution

The fourth proportional to 172,418.12, 258,435.42 and 72,548.84 is: 108,742.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,418.12 : 258,435.42 = 72,548.84 : x
  2. Step 2: Convert to fraction form
    172,418.12/258,435.42 = 72,548.84/x
  3. Step 3: Cross multiply
    172,418.12x = 258,435.42 × 72,548.84
  4. Step 4: Simplify right side
    172,418.12x = 18,749,189,935.91
  5. Step 5: Solve for x
    x = 18,749,189,935.91/172,418.12
  6. Step 6: Final answer
    x = 108,742.57

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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.