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Finding the Fourth Proportional to 859.18, 1,185.78 and 565.12

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Solution

The fourth proportional to 859.18, 1,185.78 and 565.12 is: 779.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.18 : 1,185.78 = 565.12 : x
  2. Step 2: Convert to fraction form
    859.18/1,185.78 = 565.12/x
  3. Step 3: Cross multiply
    859.18x = 1,185.78 × 565.12
  4. Step 4: Simplify right side
    859.18x = 670,107.99
  5. Step 5: Solve for x
    x = 670,107.99/859.18
  6. Step 6: Final answer
    x = 779.94

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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.