Home / 21,028.30-29,021.10-15,713.88

Finding the Fourth Proportional to 21,028.30, 29,021.10 and 15,713.88

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Solution

The fourth proportional to 21,028.30, 29,021.10 and 15,713.88 is: 21,686.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,028.30 : 29,021.10 = 15,713.88 : x
  2. Step 2: Convert to fraction form
    21,028.30/29,021.10 = 15,713.88/x
  3. Step 3: Cross multiply
    21,028.30x = 29,021.10 × 15,713.88
  4. Step 4: Simplify right side
    21,028.30x = 456,034,082.87
  5. Step 5: Solve for x
    x = 456,034,082.87/21,028.30
  6. Step 6: Final answer
    x = 21,686.68

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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.