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Finding the Fourth Proportional to 20,681.50, 31,032.50 and 8,201.25

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Solution

The fourth proportional to 20,681.50, 31,032.50 and 8,201.25 is: 12,305.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.50 : 31,032.50 = 8,201.25 : x
  2. Step 2: Convert to fraction form
    20,681.50/31,032.50 = 8,201.25/x
  3. Step 3: Cross multiply
    20,681.50x = 31,032.50 × 8,201.25
  4. Step 4: Simplify right side
    20,681.50x = 254,505,290.63
  5. Step 5: Solve for x
    x = 254,505,290.63/20,681.50
  6. Step 6: Final answer
    x = 12,305.94

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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.