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Finding the Fourth Proportional to 2,626, 3,938.40 and 982.72

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Solution

The fourth proportional to 2,626, 3,938.40 and 982.72 is: 1,473.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,626 : 3,938.40 = 982.72 : x
  2. Step 2: Convert to fraction form
    2,626/3,938.40 = 982.72/x
  3. Step 3: Cross multiply
    2,626x = 3,938.40 × 982.72
  4. Step 4: Simplify right side
    2,626x = 3,870,344.45
  5. Step 5: Solve for x
    x = 3,870,344.45/2,626
  6. Step 6: Final answer
    x = 1,473.86

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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.