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Finding the Fourth Proportional to 891.65, 1,230.04 and 629.09

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Solution

The fourth proportional to 891.65, 1,230.04 and 629.09 is: 867.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.65 : 1,230.04 = 629.09 : x
  2. Step 2: Convert to fraction form
    891.65/1,230.04 = 629.09/x
  3. Step 3: Cross multiply
    891.65x = 1,230.04 × 629.09
  4. Step 4: Simplify right side
    891.65x = 773,805.86
  5. Step 5: Solve for x
    x = 773,805.86/891.65
  6. Step 6: Final answer
    x = 867.84

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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.