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Finding the Fourth Proportional to 172,168.86, 258,212.27 and 72,330.99

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Solution

The fourth proportional to 172,168.86, 258,212.27 and 72,330.99 is: 108,479.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,168.86 : 258,212.27 = 72,330.99 : x
  2. Step 2: Convert to fraction form
    172,168.86/258,212.27 = 72,330.99/x
  3. Step 3: Cross multiply
    172,168.86x = 258,212.27 × 72,330.99
  4. Step 4: Simplify right side
    172,168.86x = 18,676,748,757.59
  5. Step 5: Solve for x
    x = 18,676,748,757.59/172,168.86
  6. Step 6: Final answer
    x = 108,479.25

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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.