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Finding the Fourth Proportional to 172,978.12, 259,478.12 and 73,119.70

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Solution

The fourth proportional to 172,978.12, 259,478.12 and 73,119.70 is: 109,684.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,978.12 : 259,478.12 = 73,119.70 : x
  2. Step 2: Convert to fraction form
    172,978.12/259,478.12 = 73,119.70/x
  3. Step 3: Cross multiply
    172,978.12x = 259,478.12 × 73,119.70
  4. Step 4: Simplify right side
    172,978.12x = 18,972,962,290.96
  5. Step 5: Solve for x
    x = 18,972,962,290.96/172,978.12
  6. Step 6: Final answer
    x = 109,684.17

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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.