Home / 21,206.40-29,245.29-13,639.38

Finding the Fourth Proportional to 21,206.40, 29,245.29 and 13,639.38

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Solution

The fourth proportional to 21,206.40, 29,245.29 and 13,639.38 is: 18,809.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,206.40 : 29,245.29 = 13,639.38 : x
  2. Step 2: Convert to fraction form
    21,206.40/29,245.29 = 13,639.38/x
  3. Step 3: Cross multiply
    21,206.40x = 29,245.29 × 13,639.38
  4. Step 4: Simplify right side
    21,206.40x = 398,887,623.52
  5. Step 5: Solve for x
    x = 398,887,623.52/21,206.40
  6. Step 6: Final answer
    x = 18,809.78

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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.