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Finding the Fourth Proportional to 221,663.20, 311,115.80 and 221,663.20

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Solution

The fourth proportional to 221,663.20, 311,115.80 and 221,663.20 is: 311,115.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,663.20 : 311,115.80 = 221,663.20 : x
  2. Step 2: Convert to fraction form
    221,663.20/311,115.80 = 221,663.20/x
  3. Step 3: Cross multiply
    221,663.20x = 311,115.80 × 221,663.20
  4. Step 4: Simplify right side
    221,663.20x = 68,962,923,798.56
  5. Step 5: Solve for x
    x = 68,962,923,798.56/221,663.20
  6. Step 6: Final answer
    x = 311,115.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.