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Finding the Fourth Proportional to 221,383.89, 305,455.42 and 129,488.88

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Solution

The fourth proportional to 221,383.89, 305,455.42 and 129,488.88 is: 178,662.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,383.89 : 305,455.42 = 129,488.88 : x
  2. Step 2: Convert to fraction form
    221,383.89/305,455.42 = 129,488.88/x
  3. Step 3: Cross multiply
    221,383.89x = 305,455.42 × 129,488.88
  4. Step 4: Simplify right side
    221,383.89x = 39,553,081,533.05
  5. Step 5: Solve for x
    x = 39,553,081,533.05/221,383.89
  6. Step 6: Final answer
    x = 178,662.87

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1.5x scale

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.