Home / 21,628.76-29,849.78-13,128.92

Finding the Fourth Proportional to 21,628.76, 29,849.78 and 13,128.92

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Solution

The fourth proportional to 21,628.76, 29,849.78 and 13,128.92 is: 18,119.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,628.76 : 29,849.78 = 13,128.92 : x
  2. Step 2: Convert to fraction form
    21,628.76/29,849.78 = 13,128.92/x
  3. Step 3: Cross multiply
    21,628.76x = 29,849.78 × 13,128.92
  4. Step 4: Simplify right side
    21,628.76x = 391,895,382.62
  5. Step 5: Solve for x
    x = 391,895,382.62/21,628.76
  6. Step 6: Final answer
    x = 18,119.18

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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.