Home / 21,686.09-29,919.32-13,185.54

Finding the Fourth Proportional to 21,686.09, 29,919.32 and 13,185.54

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Solution

The fourth proportional to 21,686.09, 29,919.32 and 13,185.54 is: 18,191.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,686.09 : 29,919.32 = 13,185.54 : x
  2. Step 2: Convert to fraction form
    21,686.09/29,919.32 = 13,185.54/x
  3. Step 3: Cross multiply
    21,686.09x = 29,919.32 × 13,185.54
  4. Step 4: Simplify right side
    21,686.09x = 394,502,324.71
  5. Step 5: Solve for x
    x = 394,502,324.71/21,686.09
  6. Step 6: Final answer
    x = 18,191.50

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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.