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Finding the Fourth Proportional to 868.55, 1,198.71 and 669.60

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Solution

The fourth proportional to 868.55, 1,198.71 and 669.60 is: 924.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.55 : 1,198.71 = 669.60 : x
  2. Step 2: Convert to fraction form
    868.55/1,198.71 = 669.60/x
  3. Step 3: Cross multiply
    868.55x = 1,198.71 × 669.60
  4. Step 4: Simplify right side
    868.55x = 802,656.22
  5. Step 5: Solve for x
    x = 802,656.22/868.55
  6. Step 6: Final answer
    x = 924.14

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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.