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Finding the Fourth Proportional to 855.21, 1,180.15 and 540.64

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Solution

The fourth proportional to 855.21, 1,180.15 and 540.64 is: 746.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.21 : 1,180.15 = 540.64 : x
  2. Step 2: Convert to fraction form
    855.21/1,180.15 = 540.64/x
  3. Step 3: Cross multiply
    855.21x = 1,180.15 × 540.64
  4. Step 4: Simplify right side
    855.21x = 638,036.30
  5. Step 5: Solve for x
    x = 638,036.30/855.21
  6. Step 6: Final answer
    x = 746.06

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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.