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Finding the Fourth Proportional to 21,839.55, 32,773.73 and 7,988.55

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Solution

The fourth proportional to 21,839.55, 32,773.73 and 7,988.55 is: 11,988.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,839.55 : 32,773.73 = 7,988.55 : x
  2. Step 2: Convert to fraction form
    21,839.55/32,773.73 = 7,988.55/x
  3. Step 3: Cross multiply
    21,839.55x = 32,773.73 × 7,988.55
  4. Step 4: Simplify right side
    21,839.55x = 261,814,540.85
  5. Step 5: Solve for x
    x = 261,814,540.85/21,839.55
  6. Step 6: Final answer
    x = 11,988.09

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1.5x scale

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.