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Finding the Fourth Proportional to 1,179.63, 1,769.13 and 486.09

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Solution

The fourth proportional to 1,179.63, 1,769.13 and 486.09 is: 729.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.63 : 1,769.13 = 486.09 : x
  2. Step 2: Convert to fraction form
    1,179.63/1,769.13 = 486.09/x
  3. Step 3: Cross multiply
    1,179.63x = 1,769.13 × 486.09
  4. Step 4: Simplify right side
    1,179.63x = 859,956.40
  5. Step 5: Solve for x
    x = 859,956.40/1,179.63
  6. Step 6: Final answer
    x = 729.01

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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.