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Finding the Fourth Proportional to 859.20, 1,185.90 and 564.63

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Solution

The fourth proportional to 859.20, 1,185.90 and 564.63 is: 779.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.20 : 1,185.90 = 564.63 : x
  2. Step 2: Convert to fraction form
    859.20/1,185.90 = 564.63/x
  3. Step 3: Cross multiply
    859.20x = 1,185.90 × 564.63
  4. Step 4: Simplify right side
    859.20x = 669,594.72
  5. Step 5: Solve for x
    x = 669,594.72/859.20
  6. Step 6: Final answer
    x = 779.32

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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.