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Finding the Fourth Proportional to 855.56, 1,180.20 and 575.30

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Solution

The fourth proportional to 855.56, 1,180.20 and 575.30 is: 793.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.56 : 1,180.20 = 575.30 : x
  2. Step 2: Convert to fraction form
    855.56/1,180.20 = 575.30/x
  3. Step 3: Cross multiply
    855.56x = 1,180.20 × 575.30
  4. Step 4: Simplify right side
    855.56x = 678,974.17
  5. Step 5: Solve for x
    x = 678,974.17/855.56
  6. Step 6: Final answer
    x = 793.60

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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.