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Finding the Fourth Proportional to 223,708.55, 308,731.10 and 128,221.43

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Solution

The fourth proportional to 223,708.55, 308,731.10 and 128,221.43 is: 176,953.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,708.55 : 308,731.10 = 128,221.43 : x
  2. Step 2: Convert to fraction form
    223,708.55/308,731.10 = 128,221.43/x
  3. Step 3: Cross multiply
    223,708.55x = 308,731.10 × 128,221.43
  4. Step 4: Simplify right side
    223,708.55x = 39,585,940,942.71
  5. Step 5: Solve for x
    x = 39,585,940,942.71/223,708.55
  6. Step 6: Final answer
    x = 176,953.19

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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.