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Finding the Fourth Proportional to 868.30, 1,198.51 and 619.22

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Solution

The fourth proportional to 868.30, 1,198.51 and 619.22 is: 854.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.30 : 1,198.51 = 619.22 : x
  2. Step 2: Convert to fraction form
    868.30/1,198.51 = 619.22/x
  3. Step 3: Cross multiply
    868.30x = 1,198.51 × 619.22
  4. Step 4: Simplify right side
    868.30x = 742,142.81
  5. Step 5: Solve for x
    x = 742,142.81/868.30
  6. Step 6: Final answer
    x = 854.71

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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.