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Finding the Fourth Proportional to 867.98, 1,198.62 and 558.02

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Solution

The fourth proportional to 867.98, 1,198.62 and 558.02 is: 770.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.98 : 1,198.62 = 558.02 : x
  2. Step 2: Convert to fraction form
    867.98/1,198.62 = 558.02/x
  3. Step 3: Cross multiply
    867.98x = 1,198.62 × 558.02
  4. Step 4: Simplify right side
    867.98x = 668,853.93
  5. Step 5: Solve for x
    x = 668,853.93/867.98
  6. Step 6: Final answer
    x = 770.59

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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.