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Finding the Fourth Proportional to 982.98, 1,474.65 and 618.21

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Solution

The fourth proportional to 982.98, 1,474.65 and 618.21 is: 927.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.98 : 1,474.65 = 618.21 : x
  2. Step 2: Convert to fraction form
    982.98/1,474.65 = 618.21/x
  3. Step 3: Cross multiply
    982.98x = 1,474.65 × 618.21
  4. Step 4: Simplify right side
    982.98x = 911,643.38
  5. Step 5: Solve for x
    x = 911,643.38/982.98
  6. Step 6: Final answer
    x = 927.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.