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Finding the Fourth Proportional to 3,271.25, 4,906.99 and 931.39

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Solution

The fourth proportional to 3,271.25, 4,906.99 and 931.39 is: 1,397.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,271.25 : 4,906.99 = 931.39 : x
  2. Step 2: Convert to fraction form
    3,271.25/4,906.99 = 931.39/x
  3. Step 3: Cross multiply
    3,271.25x = 4,906.99 × 931.39
  4. Step 4: Simplify right side
    3,271.25x = 4,570,321.42
  5. Step 5: Solve for x
    x = 4,570,321.42/3,271.25
  6. Step 6: Final answer
    x = 1,397.12

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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.