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Finding the Fourth Proportional to 21,653.99, 29,903.14 and 20,474.67

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Solution

The fourth proportional to 21,653.99, 29,903.14 and 20,474.67 is: 28,274.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,653.99 : 29,903.14 = 20,474.67 : x
  2. Step 2: Convert to fraction form
    21,653.99/29,903.14 = 20,474.67/x
  3. Step 3: Cross multiply
    21,653.99x = 29,903.14 × 20,474.67
  4. Step 4: Simplify right side
    21,653.99x = 612,256,821.09
  5. Step 5: Solve for x
    x = 612,256,821.09/21,653.99
  6. Step 6: Final answer
    x = 28,274.56

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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.