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Finding the Fourth Proportional to 855.33, 1,179.21 and 619.62

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Solution

The fourth proportional to 855.33, 1,179.21 and 619.62 is: 854.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.33 : 1,179.21 = 619.62 : x
  2. Step 2: Convert to fraction form
    855.33/1,179.21 = 619.62/x
  3. Step 3: Cross multiply
    855.33x = 1,179.21 × 619.62
  4. Step 4: Simplify right side
    855.33x = 730,662.10
  5. Step 5: Solve for x
    x = 730,662.10/855.33
  6. Step 6: Final answer
    x = 854.25

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1.5x scale

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.