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Finding the Fourth Proportional to 855.17, 1,175.01 and 680.21

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Solution

The fourth proportional to 855.17, 1,175.01 and 680.21 is: 934.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.17 : 1,175.01 = 680.21 : x
  2. Step 2: Convert to fraction form
    855.17/1,175.01 = 680.21/x
  3. Step 3: Cross multiply
    855.17x = 1,175.01 × 680.21
  4. Step 4: Simplify right side
    855.17x = 799,253.55
  5. Step 5: Solve for x
    x = 799,253.55/855.17
  6. Step 6: Final answer
    x = 934.61

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.