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Finding the Fourth Proportional to 21,729.81, 29,987.15 and 11,793.81

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Solution

The fourth proportional to 21,729.81, 29,987.15 and 11,793.81 is: 16,275.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,729.81 : 29,987.15 = 11,793.81 : x
  2. Step 2: Convert to fraction form
    21,729.81/29,987.15 = 11,793.81/x
  3. Step 3: Cross multiply
    21,729.81x = 29,987.15 × 11,793.81
  4. Step 4: Simplify right side
    21,729.81x = 353,662,749.54
  5. Step 5: Solve for x
    x = 353,662,749.54/21,729.81
  6. Step 6: Final answer
    x = 16,275.46

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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.