Home / 21,479.21-29,639.79-11,919.59

Finding the Fourth Proportional to 21,479.21, 29,639.79 and 11,919.59

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Solution

The fourth proportional to 21,479.21, 29,639.79 and 11,919.59 is: 16,448.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,479.21 : 29,639.79 = 11,919.59 : x
  2. Step 2: Convert to fraction form
    21,479.21/29,639.79 = 11,919.59/x
  3. Step 3: Cross multiply
    21,479.21x = 29,639.79 × 11,919.59
  4. Step 4: Simplify right side
    21,479.21x = 353,293,996.29
  5. Step 5: Solve for x
    x = 353,293,996.29/21,479.21
  6. Step 6: Final answer
    x = 16,448.19

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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.