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Finding the Fourth Proportional to 859.43, 1,185.77 and 505.22

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Solution

The fourth proportional to 859.43, 1,185.77 and 505.22 is: 697.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.43 : 1,185.77 = 505.22 : x
  2. Step 2: Convert to fraction form
    859.43/1,185.77 = 505.22/x
  3. Step 3: Cross multiply
    859.43x = 1,185.77 × 505.22
  4. Step 4: Simplify right side
    859.43x = 599,073.88
  5. Step 5: Solve for x
    x = 599,073.88/859.43
  6. Step 6: Final answer
    x = 697.06

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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.