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Finding the Fourth Proportional to 855.40, 1,180.56 and 620.11

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Solution

The fourth proportional to 855.40, 1,180.56 and 620.11 is: 855.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.40 : 1,180.56 = 620.11 : x
  2. Step 2: Convert to fraction form
    855.40/1,180.56 = 620.11/x
  3. Step 3: Cross multiply
    855.40x = 1,180.56 × 620.11
  4. Step 4: Simplify right side
    855.40x = 732,077.06
  5. Step 5: Solve for x
    x = 732,077.06/855.40
  6. Step 6: Final answer
    x = 855.83

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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.