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Finding the Fourth Proportional to 221,447.70, 332,171.55 and 81,188.10

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Solution

The fourth proportional to 221,447.70, 332,171.55 and 81,188.10 is: 121,782.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,447.70 : 332,171.55 = 81,188.10 : x
  2. Step 2: Convert to fraction form
    221,447.70/332,171.55 = 81,188.10/x
  3. Step 3: Cross multiply
    221,447.70x = 332,171.55 × 81,188.10
  4. Step 4: Simplify right side
    221,447.70x = 26,968,377,018.56
  5. Step 5: Solve for x
    x = 26,968,377,018.56/221,447.70
  6. Step 6: Final answer
    x = 121,782.15

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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.