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Finding the Fourth Proportional to 172,215.40, 258,360.60 and 72,318.64

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Solution

The fourth proportional to 172,215.40, 258,360.60 and 72,318.64 is: 108,493.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,215.40 : 258,360.60 = 72,318.64 : x
  2. Step 2: Convert to fraction form
    172,215.40/258,360.60 = 72,318.64/x
  3. Step 3: Cross multiply
    172,215.40x = 258,360.60 × 72,318.64
  4. Step 4: Simplify right side
    172,215.40x = 18,684,287,221.58
  5. Step 5: Solve for x
    x = 18,684,287,221.58/172,215.40
  6. Step 6: Final answer
    x = 108,493.71

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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.