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Finding the Fourth Proportional to 859.49, 1,185.26 and 638.97

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Solution

The fourth proportional to 859.49, 1,185.26 and 638.97 is: 881.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.49 : 1,185.26 = 638.97 : x
  2. Step 2: Convert to fraction form
    859.49/1,185.26 = 638.97/x
  3. Step 3: Cross multiply
    859.49x = 1,185.26 × 638.97
  4. Step 4: Simplify right side
    859.49x = 757,345.58
  5. Step 5: Solve for x
    x = 757,345.58/859.49
  6. Step 6: Final answer
    x = 881.16

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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.