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Finding the Fourth Proportional to 1,190.50, 1,786.56 and 421

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Solution

The fourth proportional to 1,190.50, 1,786.56 and 421 is: 631.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.50 : 1,786.56 = 421 : x
  2. Step 2: Convert to fraction form
    1,190.50/1,786.56 = 421/x
  3. Step 3: Cross multiply
    1,190.50x = 1,786.56 × 421
  4. Step 4: Simplify right side
    1,190.50x = 752,141.76
  5. Step 5: Solve for x
    x = 752,141.76/1,190.50
  6. Step 6: Final answer
    x = 631.79

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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.