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Finding the Fourth Proportional to 868.58, 1,198.63 and 475.60

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Solution

The fourth proportional to 868.58, 1,198.63 and 475.60 is: 656.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.58 : 1,198.63 = 475.60 : x
  2. Step 2: Convert to fraction form
    868.58/1,198.63 = 475.60/x
  3. Step 3: Cross multiply
    868.58x = 1,198.63 × 475.60
  4. Step 4: Simplify right side
    868.58x = 570,068.43
  5. Step 5: Solve for x
    x = 570,068.43/868.58
  6. Step 6: Final answer
    x = 656.32

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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.