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Finding the Fourth Proportional to 855.22, 1,179.66 and 505.66

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Solution

The fourth proportional to 855.22, 1,179.66 and 505.66 is: 697.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.22 : 1,179.66 = 505.66 : x
  2. Step 2: Convert to fraction form
    855.22/1,179.66 = 505.66/x
  3. Step 3: Cross multiply
    855.22x = 1,179.66 × 505.66
  4. Step 4: Simplify right side
    855.22x = 596,506.88
  5. Step 5: Solve for x
    x = 596,506.88/855.22
  6. Step 6: Final answer
    x = 697.49

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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.