Home / 21,628.38-29,849.26-13,128.55

Finding the Fourth Proportional to 21,628.38, 29,849.26 and 13,128.55

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Solution

The fourth proportional to 21,628.38, 29,849.26 and 13,128.55 is: 18,118.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,628.38 : 29,849.26 = 13,128.55 : x
  2. Step 2: Convert to fraction form
    21,628.38/29,849.26 = 13,128.55/x
  3. Step 3: Cross multiply
    21,628.38x = 29,849.26 × 13,128.55
  4. Step 4: Simplify right side
    21,628.38x = 391,877,394.93
  5. Step 5: Solve for x
    x = 391,877,394.93/21,628.38
  6. Step 6: Final answer
    x = 18,118.67

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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.