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Finding the Fourth Proportional to 855.60, 1,180.05 and 619.58

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Solution

The fourth proportional to 855.60, 1,180.05 and 619.58 is: 854.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.60 : 1,180.05 = 619.58 : x
  2. Step 2: Convert to fraction form
    855.60/1,180.05 = 619.58/x
  3. Step 3: Cross multiply
    855.60x = 1,180.05 × 619.58
  4. Step 4: Simplify right side
    855.60x = 731,135.38
  5. Step 5: Solve for x
    x = 731,135.38/855.60
  6. Step 6: Final answer
    x = 854.53

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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.