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Finding the Fourth Proportional to 19,651.50, 27,129.53 and 15,781.05

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Solution

The fourth proportional to 19,651.50, 27,129.53 and 15,781.05 is: 21,786.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,651.50 : 27,129.53 = 15,781.05 : x
  2. Step 2: Convert to fraction form
    19,651.50/27,129.53 = 15,781.05/x
  3. Step 3: Cross multiply
    19,651.50x = 27,129.53 × 15,781.05
  4. Step 4: Simplify right side
    19,651.50x = 428,132,469.41
  5. Step 5: Solve for x
    x = 428,132,469.41/19,651.50
  6. Step 6: Final answer
    x = 21,786.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.