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Finding the Fourth Proportional to 1,189.31, 1,783.95 and 323.61

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Solution

The fourth proportional to 1,189.31, 1,783.95 and 323.61 is: 485.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.31 : 1,783.95 = 323.61 : x
  2. Step 2: Convert to fraction form
    1,189.31/1,783.95 = 323.61/x
  3. Step 3: Cross multiply
    1,189.31x = 1,783.95 × 323.61
  4. Step 4: Simplify right side
    1,189.31x = 577,304.06
  5. Step 5: Solve for x
    x = 577,304.06/1,189.31
  6. Step 6: Final answer
    x = 485.41

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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.