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Finding the Fourth Proportional to 172,997.96, 259,373.90 and 66,291.50

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Solution

The fourth proportional to 172,997.96, 259,373.90 and 66,291.50 is: 99,390.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,997.96 : 259,373.90 = 66,291.50 : x
  2. Step 2: Convert to fraction form
    172,997.96/259,373.90 = 66,291.50/x
  3. Step 3: Cross multiply
    172,997.96x = 259,373.90 × 66,291.50
  4. Step 4: Simplify right side
    172,997.96x = 17,194,285,706.01
  5. Step 5: Solve for x
    x = 17,194,285,706.01/172,997.96
  6. Step 6: Final answer
    x = 99,390.11

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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.