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Finding the Fourth Proportional to 859.15, 1,185.79 and 486.13

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Solution

The fourth proportional to 859.15, 1,185.79 and 486.13 is: 670.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.15 : 1,185.79 = 486.13 : x
  2. Step 2: Convert to fraction form
    859.15/1,185.79 = 486.13/x
  3. Step 3: Cross multiply
    859.15x = 1,185.79 × 486.13
  4. Step 4: Simplify right side
    859.15x = 576,448.09
  5. Step 5: Solve for x
    x = 576,448.09/859.15
  6. Step 6: Final answer
    x = 670.96

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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.