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Finding the Fourth Proportional to 855.13, 1,179.86 and 523.43

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Solution

The fourth proportional to 855.13, 1,179.86 and 523.43 is: 722.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.13 : 1,179.86 = 523.43 : x
  2. Step 2: Convert to fraction form
    855.13/1,179.86 = 523.43/x
  3. Step 3: Cross multiply
    855.13x = 1,179.86 × 523.43
  4. Step 4: Simplify right side
    855.13x = 617,574.12
  5. Step 5: Solve for x
    x = 617,574.12/855.13
  6. Step 6: Final answer
    x = 722.20

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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.