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Finding the Fourth Proportional to 223,311.28, 308,172 and 122,709.28

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Solution

The fourth proportional to 223,311.28, 308,172 and 122,709.28 is: 169,340.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,311.28 : 308,172 = 122,709.28 : x
  2. Step 2: Convert to fraction form
    223,311.28/308,172 = 122,709.28/x
  3. Step 3: Cross multiply
    223,311.28x = 308,172 × 122,709.28
  4. Step 4: Simplify right side
    223,311.28x = 37,815,564,236.16
  5. Step 5: Solve for x
    x = 37,815,564,236.16/223,311.28
  6. Step 6: Final answer
    x = 169,340.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.