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Finding the Fourth Proportional to 868.59, 1,198.40 and 619.92

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Solution

The fourth proportional to 868.59, 1,198.40 and 619.92 is: 855.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.59 : 1,198.40 = 619.92 : x
  2. Step 2: Convert to fraction form
    868.59/1,198.40 = 619.92/x
  3. Step 3: Cross multiply
    868.59x = 1,198.40 × 619.92
  4. Step 4: Simplify right side
    868.59x = 742,909.03
  5. Step 5: Solve for x
    x = 742,909.03/868.59
  6. Step 6: Final answer
    x = 855.30

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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.